Long-term Debt and Capital Lease Obligations, Line of Credit Facility (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Credit Agreement [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Variable rate floor (in hundredths)	1.25%
Credit Agreement [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Variable rate floor (in hundredths)	2.25%
Credit Agreement [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	0.50%
Credit Agreement [Member] | One Month Eurodollar [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	1.00%
Credit Agreement [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee (in hundredths)	0.375%
Credit Agreement [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee (in hundredths)	0.625%
Term Loan Under Credit Agreement, Variable [Member] | Maximum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	3.50%
Term Loan Under Credit Agreement, Variable [Member] | Maximum [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	2.50%
Revolver Under Credit Agreement, Variable [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 125,000
Revolver Under Credit Agreement, Variable [Member] | Maximum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	4.00%
Revolver Under Credit Agreement, Variable [Member] | Maximum [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	3.00%