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Revolving Credit Facility and Long-Term Debt - Narrative (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 Months Ended |  |
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Dec. 31, 2012 Credit Agreement [Member] quarter | Dec. 31, 2011 Credit Agreement [Member] | Dec. 31, 2012 Base Rate [Member] Credit Agreement [Member] | Dec. 19, 2012 Base Rate [Member] Credit Agreement [Member] | Dec. 31, 2012 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] | Dec. 31, 2012 London Interbank Offered Rate (LIBOR) [Member] Credit Agreement [Member] | Dec. 19, 2012 London Interbank Offered Rate (LIBOR) [Member] Credit Agreement [Member] | Dec. 31, 2012 Federal Funds Rate [Member] Credit Agreement [Member] | Dec. 31, 2012 Variable Rate 1 [Member] Credit Agreement [Member] | Dec. 31, 2011 Variable Rate 1 [Member] Credit Agreement [Member] | Dec. 31, 2012 Variable Rate 2 [Member] Credit Agreement [Member] | Dec. 31, 2011 Variable Rate 2 [Member] Credit Agreement [Member] | Dec. 19, 2012 Revolving Credit Facility [Member] Credit Agreement [Member] | Sep. 30, 2010 Revolving Credit Facility [Member] Wells Fargo [Member] | Dec. 07, 2006 Revolving Credit Facility [Member] Bank of America [Member] | Dec. 19, 2012 Term Loan [Member] Credit Agreement [Member] | Dec. 31, 2012 Bridge Loan [Member] Base Rate [Member] Credit Agreement [Member] | Dec. 31, 2012 Bridge Loan [Member] London Interbank Offered Rate (LIBOR) Market Index Rate [Member] Credit Agreement [Member] | Dec. 19, 2012 Bridge Loan [Member] London Interbank Offered Rate (LIBOR) Market Index Rate [Member] Credit Agreement [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000,000 | $ 125,000,000 | $ 30,000,000 | $ 100,000,000 |  |  |
Line of Credit Facility, Periodic Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.25% | 1.00% | 1.25% | 2.00% | 1.25% | 2.00% |  |  |  |  |  |  |  |  |  |  | 1.25% | 2.00%
Debt Instrument, Basis Spread on Base Rate |  |  |  |  |  |  | 0.01 |  | 0.0050 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Next Twelve Months, Maximum | 3.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Year Two, Maximum | 3.35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Year Three, Maximum | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Year Four, Maximum | 2.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Year Five, Maximum | 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated EBITDA to Fixed Charges Ratio, Number of Consecutive Quarters | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated EBITDA to Fixed Charges Ratio, Minimum | 1.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Net Income, Maximum | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Facility Capital Expenditures, Next Twelve Months, Maximum | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Minimum |  |  | 2.25 |  | 2.25 |  | 2.25 |  |  |  |  |  |  |  |  |  |  | 2.25 |  |
Line of Credit Facility, Remaining Borrowing Capacity | 33,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 2.98% | 1.54% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount | 150,000,000 | 24,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate |  |  |  |  |  |  |  |  |  | 2.22% | 1.55% | 2.31% | 1.84% |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Amount |  |  |  |  |  |  |  |  |  | $ 87,000,000 | $ 5,000,000 | $ 566,000 | $ 1,700,000 |  |  |  |  |  |  |

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