Income Taxes Income Taxes (Income Tax Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income before income taxes	$ 63,487	$ 53,717	$ 123,157
Federal income tax expense at statutory rate	22,221	18,801	43,105
Increases (decreases) resulting from:
State income taxes, net of federal income tax benefits	2,204	3,009	6,444
Impact of non-controlling interest	88	0	0
Non-deductible expenses	2,698	3,311	1,974
Impact of domestic production deduction	(1,889)	(2,026)	(4,256)
Tax credits	(433)	0	0
Changes in valuation allowance, net of equity and tax audit adjustments	(94)	0	870
Income tax expense	$ 24,795	$ 23,095	$ 48,137