Annual report pursuant to Section 13 and 15(d)

Income Taxes Income Taxes - Summary of Changes to Unrecognized Tax Benefits (Details)

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Income Taxes Income Taxes - Summary of Changes to Unrecognized Tax Benefits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits[Roll Forward]      
Unrecognized tax benefits, beginning balance $ 3,750 $ 3,020 $ 1,184
Additions based on tax positions related to the current year 1,689 725 1,018
Additions based on tax positions related to the prior years 23 132 818
Decrease based on tax positions related to the prior years   (127)  
Unrecognized tax benefits, ending balance $ 5,462 $ 3,750 $ 3,020