Income Taxes - Summary of Activity Related to Uncertain Tax Positions (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 at January 1,	$ 2,644	$ 1,960	$ 1,258
Additions Based on Tax Positions Related to the Current Year	331	311	454
Additions for Tax Positions of Prior Years	1,176	928	423
Prior Year Reductions	(1)	(370)	(5)
Statute Expirations	(589)	(94)	(85)
Settlements	0	(91)	(85)
Balance at December 31,	$ 3,561	$ 2,644	$ 1,960