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Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal tax provision at statutory rate	$ 121,474	$ 99,233	$ 91,947
State taxes, net of federal income tax benefit	13,308	10,784	9,357
Equity investment basis difference	0	9,470	11,048
Non-deductible items	1,316	1,436	882
Permanent differences related to stock-based compensation	(822)	139	156
Net change in valuation allowance	330	(5,133)	(3,303)
General business credits	(934)	(27,950)	(29,093)
Deferred revaluation for change in statutory tax rate	(32,901)	0	0
Other	81	(1,514)	(1,289)
Total	$ 101,852	$ 86,465	$ 79,705

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