Income Taxes (Income Tax Payments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Total income tax payments, net of refunds	$ 4,399	$ 15,124	$ 11,250
Less: credits or offsets	997	4,894	2,420
Cash paid, net	$ 3,402	$ 10,230	$ 8,830