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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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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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