Long-Term Debt, Interest Rate Swap and Capitalized Lease Obligations (Capital Lease Obligations) (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Capital Leased Assets [Line Items]
Capital lease obligations incurred		$ 293	$ 527	$ 387
Lease agreement term	3 years
Lease transaction assets purchased	$ 1,219		$ 1,219
Minimum
Capital Leased Assets [Line Items]
Lease agreement term		3 years
Maximum
Capital Leased Assets [Line Items]
Lease agreement term		5 years