Income Taxes (Unrecognized Tax Benefits) (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]
Reserve for unrecognized tax benefits (including interest and penalties)		$ 58,400,000	$ 58,600,000	$ 59,300,000
Amounts that would affect the effective tax rate if recognized		58,400,000	58,600,000	59,300,000
Federal tax effect for unrecognized tax benefits		16,800,000
Accrual of interest and penalties related to uncertain tax positions		8,800,000	8,100,000	8,300,000
Tax expense related to an increase in liabilities for interest and penalties		2,800,000	2,100,000	2,600,000
Reduction due to lapse of statute of limitations and settlements (with 2015 estimate)	$ (17,000,000)	$ (5,226,000)	$ (6,535,000)	$ (3,746,000)