Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Line Items]
Effective income tax rate	30.80%	30.40%
Valuation allowance	$ 0	$ 1,626	$ 4,000
Income tax benefit			$ 95,600
AMT credit carryover	1,384	$ 1,384
Federal
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	2,100
Unused built-in losses	53,200
State
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	68,700
Unused built-in losses	$ 28,100