Income Taxes - 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]
Unrecognized tax benefits, beginning of year	$ 2,768	$ 1,964	$ 2,530
Additions for tax positions taken in prior years	1	72	166
Reductions for tax positions taken in prior years	(426)	0	(472)
Additions for tax positions related to the current year	43	821	54
Settlements	0	0	0
Other	133	0	0
Lapses of statutes of limitations	0	(89)	(314)
Unrecognized tax benefits, end of year	2,519	2,768	1,964
Unrecognized tax benefits that would impact effective tax rate, if recognized	2,400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	500	400	$ 0
Cumulative liability for interest and penalties related to uncertain tax positions	2,500	$ 2,000
Previously unrecognized tax benefit likely to be recognized within the next 12 months	$ 600