Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings from continuing operations before income taxes:
United States	$ 408,757	$ 275,630	$ 302,809
Foreign	60,458	62,637	66,206
Earnings from continuing operations before income taxes	469,215	338,267	369,015
Current tax expense (benefit) from continuing operations:
Federal	(1,836)	(230)	234
State	5,748	6,396	4,194
Foreign	5,272	7,163	7,691
Total	9,184	13,329	12,119
Deferred tax expense from continuing operations:
Federal	135,585	90,056	98,076
State	20,111	12,429	15,399
Foreign	(1,654)	2,228	146
Total	154,042	104,713	113,621
Provision for income taxes from continuing operations	$ 163,226	$ 118,042	$ 125,740