Income Taxes - Balances in Uncertain Tax Positions (Details) - USD ($) $ in Thousands  | 
Dec. 31, 2015  | 
Dec. 31, 2014  | 
Dec. 31, 2013  | 
|---|---|---|---|
| Income Tax Disclosure [Abstract] | |||
| Balance, beginning and end of period | $ 9,482 | $ 9,482 | $ 9,482 | 
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- References No definition available. 
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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