Quarterly report pursuant to Section 13 or 15(d)

Debt and Interest Rate Swap (Details)

v3.19.2
Debt and Interest Rate Swap (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 20 Months Ended 26 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 03, 2017
May 12, 2017
Debt Instrument [Line Items]                    
Debt Instrument, Unamortized Discount                   $ (2,100)
Long-term debt $ 226,335   $ 226,335   $ 226,335 $ 226,335 $ 255,757      
Line of Credit Facility, Incremental Borrowing Capacity $ 160,000   $ 160,000   $ 160,000 $ 160,000        
Debt Instrument, Frequency of Periodic Payment     quarterly installments              
Debt Instrument, Quarterly Amortization Rate 0.25%   0.25%   0.25% 0.25%        
Debt Instrument, Call Feature     1.0% soft call premium              
Repayments of Debt           $ 193,000        
Document Period End Date     Jun. 30, 2019              
Debt Instrument, Interest Rate, Effective Percentage 4.90%   4.90%   4.90% 4.90% 4.60%     4.60%
Long-term Debt, Fair Value $ 241,200   $ 241,200   $ 241,200 $ 241,200 $ 268,100     $ 398,500
Debt Issuance Costs, Gross                   6,000
Amortization of debt issuance costs and accretion of discount on debt and leases 300 $ 300 600 $ 600            
Debt Instrument, Annual Principal Payment $ 232,000   $ 232,000   $ 232,000 $ 232,000 262,000      
Derivative, Fixed Interest Rate 4.25%   4.25%   4.25% 4.25%     1.74685%  
Derivative Asset $ 218 2,462 $ 218 2,462 $ 218 $ 218 1,623 $ 734    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) (800) 300 (1,405) 1,728            
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (623) $ 169 $ (1,111) $ 1,365 200          
Base Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate Terms     a base rate              
Debt Instrument, Basis Spread on Variable Rate     1.50%              
Fed Funds Effective Rate Overnight Index Swap Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate Terms     the federal funds rate, plus 0.50%              
Prime Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate Terms     prime rate              
One, Two, Or Three Month London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate Terms     an adjusted LIBOR rate determined on the basis of a one- three- or six-month interest period, plus 1.0%              
London Interbank Offered Rate (LIBOR) Subject to Floor [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate Terms     adjusted LIBOR rate, subject to a floor of 0.75%              
Debt Instrument, Basis Spread on Variable Rate     2.50%              
London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate     2.50%              
Medium-term Notes [Member]                    
Debt Instrument [Line Items]                    
Long-term Debt, Gross 232,000   $ 232,000   232,000 232,000 262,000     $ 425,000
Debt Instrument, Unamortized Discount (1,478)   (1,478)   (1,478) (1,478) (1,630)      
Debt Issuance Costs, Net (4,187)   (4,187)   (4,187) (4,187) (4,613)      
Long-term Debt 226,335   226,335   226,335 226,335 255,757      
Long-term Debt, Current Maturities 0   0   0 0 0      
Long-term debt 226,335   226,335   226,335 226,335 255,757      
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Derivative Financial Instruments, Assets [Member]                    
Debt Instrument [Line Items]                    
Derivative Asset $ 218   $ 218   $ 218 $ 218 $ 1,623