Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Deferred tax assets	$ 9,000	$ 13,640
Net deferred tax liability	(8,665)
Unrecognized tax deductions, share-based compensation	16,000	23,000
Potential affect of unrecognized tax benefits on effective tax rate	1,100
Interest accrued on unrecognized tax benefits	400	600
Income tax benefit, recognition of previously unrecognized tax benefits	900	2,500
Potential change in unrecognized tax benefits	1,200
Tax deductions resulting from exercise of share-based compensation awards		$ 2,200	$ 8,100
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards	7,000
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 205,000