Intangible Assets (Amortization Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Total amortization of intangible assets	$ 2,017	$ 687
Retailer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortization of intangible assets	1,577	614
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortization of intangible assets	$ 440	$ 73