Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

v3.10.0.1
Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2009
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Valuation Allowance [Line Items]                  
Income tax provision (benefit)           $ 11,225 $ (29,515) $ 9,361 $ (27,494)
Unrecognized Tax Benefits, Period Increase (Decrease)               500  
Unrecognized Tax Benefits, Interest on Income Taxes Accrued           800   800  
Unrecognized Tax Benefits, Income Tax Penalties Accrued           $ 200   $ 200  
Domestic Tax Authority [Member]                  
Valuation Allowance [Line Items]                  
Open Tax Year     2013            
State and Local Jurisdiction [Member]                  
Valuation Allowance [Line Items]                  
Open Tax Year       2012          
Income Tax Examination, Year under Examination 2015 2014              
Foreign Tax Authority [Member]                  
Valuation Allowance [Line Items]                  
Open Tax Year         2009        
Minimum [Member]                  
Valuation Allowance [Line Items]                  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent               21.00%  
Maximum [Member]                  
Valuation Allowance [Line Items]                  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent               35.00%