Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of income taxes
Federal tax rate (as a percent)	35.00%	35.00%	35.00%
Federal tax provision computed at 35%	$ 183,813	$ 97,616	$ 154,235
State tax provision, net of federal tax provision	12,865	8,320	9,149
General business credits	(12,195)	(13,346)	(10,980)
Incentive stock option expense	(181)	(304)	(479)
Section 199 deduction	(11,735)	(10,861)	(15,629)
Nondeductible compensation expense	13,000	22,813	2,609
Nondeductible expenses	(461)	105	(2,676)
Total income tax expense	$ 185,106us-gaap_IncomeTaxExpenseBenefit	$ 104,343us-gaap_IncomeTaxExpenseBenefit	$ 136,229us-gaap_IncomeTaxExpenseBenefit

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to incentive stock option expense under enacted tax laws during the period.

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