Income Taxes - Unrecognized Tax Benefits - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 135,000	$ 0	$ 10,547,000	$ 6,580,000
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	0	0	6,600,000
Interest expense (benefit) on unrecognized income tax benefits	0	(500,000)	$ 100,000
Interest on income taxes accrued	$ 0	$ 0