Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Taxes [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 900,000		$ 900,000
Amount of interest and penalties included in liabilities for uncertain tax positions	500,000		500,000
Cash paid for income taxes (refunds received), net	$ 70,800,000	$ 22,100,000	$ 70,379,000	$ 22,028,000