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Long-Term Debt (Narrative) (Details) (USD $) | 3 Months Ended |  |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2013 Credit Agreement [Member] quarter | Dec. 31, 2012 Credit Agreement [Member] | Dec. 19, 2012 Revolving Credit Facility [Member] Credit Agreement [Member] | Sep. 30, 2010 Revolving Credit Facility [Member] Wells Fargo [Member] | Dec. 19, 2012 Term Loan [Member] Credit Agreement [Member] | Mar. 31, 2013 Base Rate [Member] Credit Agreement [Member] | Dec. 19, 2012 Base Rate [Member] Credit Agreement [Member] | Mar. 31, 2013 Base Rate [Member] Bridge Loan [Member] Credit Agreement [Member] | Mar. 31, 2013 London Interbank Offered Rate (LIBOR) Market Index Rate [Member] Credit Agreement [Member] | Dec. 19, 2012 London Interbank Offered Rate (LIBOR) Market Index Rate [Member] Credit Agreement [Member] | Mar. 31, 2013 London Interbank Offered Rate (LIBOR) Market Index Rate [Member] Bridge Loan [Member] Credit Agreement [Member] | Dec. 19, 2012 London Interbank Offered Rate (LIBOR) Market Index Rate [Member] Bridge Loan [Member] Credit Agreement [Member] | Mar. 31, 2013 Federal Funds Rate [Member] Credit Agreement [Member] | Mar. 31, 2013 London Interbank Offered Rate (LIBOR) [Member] Credit Agreement [Member] | Dec. 19, 2012 London Interbank Offered Rate (LIBOR) [Member] Credit Agreement [Member] | Mar. 31, 2013 Variable Rate 1 [Member] Credit Agreement [Member] | Dec. 31, 2012 Variable Rate 1 [Member] Credit Agreement [Member] | Mar. 31, 2013 Variable Rate 2 [Member] Credit Agreement [Member] | Dec. 31, 2012 Variable Rate 2 [Member] Credit Agreement [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 175,000,000 | $ 125,000,000 | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic payment |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.25% | 1.00% |  | 1.25% | 2.00% | 1.25% | 2.00% |  | 1.25% | 2.00% |  |  |  |
Covenant terms, consolidated total leverage ratio, minimum |  |  |  |  |  | 2.25 |  | 2.25 | 2.25 |  |  |  |  | 2.25 |  |  |  |  |
Basis spread on base rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.0050 | 0.01 |  |  |  |  |
Covenant terms, consolidated total leverage ratio, next twelve months, maximum | 3.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant terms, consolidated total leverage ratio, year two, maximum | 3.35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant terms, consolidated total leverage ratio, year three, maximum | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant terms, consolidated total leverage ratio, year four, maximum | 2.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant terms, consolidated total leverage ratio, year five, maximum | 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant terms, consolidated EBITDA to fixed charges ratio, number of consecutive quarters | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant terms, consolidated EBITDA to fixed charges ratio, Minimum | 1.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant terms, consolidated net income, maximum | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant terms, facility capital expenditures, next twelve months, maximum | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant compliance, consolidated total leverage ratio | 3.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity | 18,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, percentage bearing fixed interest, percentage rate | 2.98% | 2.98% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, percentage bearing fixed interest, amount | 150,000,000 | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, percentage bearing variable interest, percentage rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.21% | 2.22% | 2.29% | 2.31%
Debt, percentage bearing variable interest, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 97,500,000 | $ 87,000,000 | $ 6,800,000 | $ 566,000

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