Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings from continuing operations before income taxes:
United States	$ 275,912	$ 302,689	$ 241,672
Foreign	62,637	66,206	61,445
Earnings from continuing operations before income taxes	338,549	368,895	303,117
Current tax expense (benefit) from continuing operations:
Federal	(230)us-gaap_CurrentFederalTaxExpenseBenefit	233us-gaap_CurrentFederalTaxExpenseBenefit	(4,157)us-gaap_CurrentFederalTaxExpenseBenefit
State	6,396	4,194	11,514
Foreign	7,163us-gaap_CurrentForeignTaxExpenseBenefit	7,691us-gaap_CurrentForeignTaxExpenseBenefit	7,759us-gaap_CurrentForeignTaxExpenseBenefit
Total	13,329us-gaap_CurrentIncomeTaxExpenseBenefit	12,118us-gaap_CurrentIncomeTaxExpenseBenefit	15,116us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense from continuing operations:
Federal	90,104	98,036	77,819
State	12,429	15,399	3,871
Foreign	2,228	146	5,412
Total	104,761us-gaap_DeferredIncomeTaxExpenseBenefit	113,581us-gaap_DeferredIncomeTaxExpenseBenefit	87,102us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes from continuing operations	$ 118,090us-gaap_IncomeTaxExpenseBenefit	$ 125,699us-gaap_IncomeTaxExpenseBenefit	$ 102,218us-gaap_IncomeTaxExpenseBenefit

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