Business Combinations (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Aug. 01, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business Combinations [Abstract]
Business Acquisition, Purchase Price Allocation, Assets Acquired	$ 97,181,000
Acquisition cost		482,000	0	0
Cash consideration paid in acquisition	10,251,000	10,251,000	0	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities		85,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets		89,300,000
Business Acquisition, Cost of Acquired Entity, Cash Paid		10,251,000	0	0
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred		482,000
Business Acquisition, Purchase Price Allocation, Deferred Taxes Asset (Liability), Net, Noncurrent		$ 620,000