Income Taxes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Taxes [Line Items]
Unrecognized tax benefits	$ 28,261,000		$ 28,099,000
Effective income tax rate	5.60%	5.50%
Unrecognized tax benefits that would impact effective tax rate	$ 21,431,000
Federal [Member]
Income Taxes [Line Items]
Change in operating loss carryforward	437,000
Operating loss carryforwards	113,580,000
Operating loss carryforwards, valuation allowance	$ 0
Operating loss carryforwards, expiration beginning dates	Jan. 01, 2032
Unrecognized tax benefits	$ 63,140,000
Deferred tax assets, operating loss carryforwards	176,720,000
State [Member]
Income Taxes [Line Items]
Change in operating loss carryforward	9,443,000
Operating loss carryforwards	$ 584,688,000
Operating loss carryforwards, expiration beginning dates	Jan. 01, 2023
Unrecognized tax benefits	$ 85,128,000
Deferred tax assets, operating loss carryforwards	$ 669,816,000