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Long-Term Debt (Details) (USD $) | 0 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  | 0 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | May 15, 2012 Maximum | May 15, 2012 Minimum | Dec. 31, 2012 Term Loan Facility | Dec. 31, 2011 Term Loan Facility | May 15, 2012 Term Loan Facility $100 million term A loan facility, due May 2017 | Dec. 31, 2012 Term Loan Facility $100 million term A loan facility, due May 2017 | Dec. 31, 2011 Term Loan Facility $100 million term A loan facility, due May 2017 | Dec. 31, 2012 Term Loan Facility $365 million term B loan facility, due May 2019 | May 15, 2012 Term Loan Facility $365 million term B loan facility, due May 2019 | Dec. 31, 2011 Term Loan Facility $365 million term B loan facility, due May 2019 | May 15, 2012 Term Loan Facility $365 million term B loan facility, due May 2019 Eurodollar | May 15, 2012 Term Loan Facility $365 million term B loan facility, due May 2019 Base Rate | May 15, 2012 Term Loan Facility Revolving Loans and Term A Loans Eurodollar Maximum | May 15, 2012 Term Loan Facility Revolving Loans and Term A Loans Eurodollar Minimum | May 15, 2012 Term Loan Facility Revolving Loans and Term A Loans Base Rate Maximum | May 15, 2012 Term Loan Facility Revolving Loans and Term A Loans Base Rate Minimum | May 15, 2012 Term Loan Facility Senior Secured Credit Agreement | Dec. 31, 2012 Revolving Credit Facility | Dec. 31, 2011 Revolving Credit Facility | Dec. 31, 2012 Revolving Credit Facility $75 million revolving credit facility, due May 2017 | May 15, 2012 Revolving Credit Facility $75 million revolving credit facility, due May 2017 | Dec. 31, 2011 Revolving Credit Facility $75 million revolving credit facility, due May 2017 | May 15, 2012 Revolving Credit Facility $75 million revolving credit facility, due May 2017 Letters of Credit | May 15, 2012 Leverage Ratio Greater Than or Equal to 3 Revolving Credit Facility $75 million revolving credit facility, due May 2017 | May 15, 2012 Leverage Ratio Less Than 3 but Greater Than or Equial to 2 Revolving Credit Facility $75 million revolving credit facility, due May 2017 | May 15, 2012 Leverage Ratio Less Than 3 but Greater Than or Equial to 2 Revolving Credit Facility $75 million revolving credit facility, due May 2017 Maximum | May 15, 2012 Leverage Ratio Less Than 3 but Greater Than or Equial to 2 Revolving Credit Facility $75 million revolving credit facility, due May 2017 Minimum | May 15, 2012 Leverage Ratio Less Than 2 Revolving Credit Facility $75 million revolving credit facility, due May 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Debt | $ 426,588,000 | $ 86,750,000 |  |  | $ 0 | $ 43,750,000 |  | $ 92,500,000 | $ 0 | $ 334,088,000 |  | $ 0 |  |  |  |  |  |  |  | $ 0 | $ 43,000,000 | $ 0 |  | $ 0 |  |  |  |  |  |
Face amount of term loan |  |  |  |  |  |  | 100,000,000 |  |  |  | 365,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |
Term of instrument |  |  |  |  |  |  | 5 years |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Sublimit for letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |
Increase to borrowing capacity available under credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 3.75% | 2.75% | 3.25% | 2.75% | 2.25% | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, unused portion, commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 0.40% |  |  | 0.30%
Leverage ratio required |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 3.00 | 2 | 2.00
Interest rate at year end |  |  |  |  |  |  |  | 3.20% |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate | 4.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Frequency of amortization payment |  |  |  |  |  |  | quarterly amortization payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly amortization payments |  |  |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio | 2.73 |  | 4.25 | 3.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 72,200,000 |  |  |  |  |  |  |  |

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