Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of beginning of period	$ 11,311	$ 2,975	$ 3,672
Additions for prior year tax positions	0	2,838	0
Reductions for prior year tax positions	0	0	(580)
Additions for current year tax positions	693	5,498	706
Reductions for current year tax positions	0	0	0
Reductions related to closed years/settlements with tax authorities	0	0	(823)
Balance as of end of period	$ 12,004	$ 11,311	$ 2,975