Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	$ 146,915	$ 111,047	$ (10,137)
Current State Tax Expense (Benefit)	15,713	10,882	2,403
Current Foreign Tax Expense (Benefit)	14,508	13,837	5,104
Current Income Tax Expense (Benefit)	177,136	135,766	(2,630)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)	12,563	5,036	154,299
Deferred State Income Tax Expense (Benefit)	1,300	(1,373)	17,205
Deferred Foreign Income Tax Expense (Benefit)	5,753	(2,456)	0
Deferred Income Tax Expense (Benefit)	19,616	1,207	171,504
Tax expense (benefit) relating to uncertain tax positions, including accrued interest	4,338	(7,818)	9,967
Income Tax Expense (Benefit)	$ 201,090	$ 129,155	$ 178,841