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Long-term debt (Details) (USD $) |  |  | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | May 31, 2011 New Credit Agreement | Dec. 31, 2011 New Credit Agreement quater | Dec. 31, 2010 New Credit Agreement | Aug. 31, 2010 New Credit Agreement | May 31, 2011 New Credit Agreement Maximum | Dec. 31, 2011 New Credit Agreement Base rate Maximum | Dec. 31, 2011 New Credit Agreement LIBOR Maximum | Aug. 31, 2010 Revolving Credit Facility Y | Dec. 31, 2011 Revolving Credit Facility | Dec. 31, 2011 Revolving Credit Facility Base rate | Dec. 31, 2011 Revolving Credit Facility LIBOR | Aug. 31, 2010 Term Loan Facility Y | Dec. 31, 2011 Term Loan Facility | Dec. 31, 2011 Term Loan Facility LIBOR
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term (in years) |  |  |  |  |  |  |  |  |  | 5 |  |  |  | 5 |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  | $ 100,000,000 |  |
Additional borrowing capacity |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |
Amount outstanding | 1,300,000 | 3,800,000 |  |  |  |  |  |  |  |  | 117,400,000 |  |  |  | 91,300,000 |
Margin on variable rate (as a percent) |  |  |  |  |  |  |  | 2.25% | 3.25% |  |  | 2.00% | 3.00% |  |  | 3.00%
Preceding number of quarters in which consolidated leverage ratio is measured |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Portion of credit facility charged at variable rate |  |  |  |  |  |  |  |  |  |  |  | 17,400,000 | 100,000,000 |  |  | 100,000,000
Effective interest rate (as a percent) |  |  |  | 3.40% | 3.40% |  |  |  |  |  |  |  |  |  |  |
Amount of restricted net assets | 186,000,000 | 178,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | 47,105,000 | 22,944,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs incurred |  |  | 800,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferred debt issuance costs, net |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of amortization of principal amount in year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |
Percentage of amortization of principal amount in year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |
Percentage of amortization of principal amount in year 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |
Percentage of amortization of principal amount in year 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |
Percentage of amortization of principal amount in year 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |
Aggregate maturities of long-term debt under contractual obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | 17,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 26,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 139,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specified settlement amounts excluded from EBITDA under amended agreement |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |

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- Definition Represents the percentage of the principal amount of debt by which it will be amortized in year one. + References No definition available. + Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: 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 + Details
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- Definition Amount of long-term debt maturing within the next twelve months following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -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 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -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 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -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 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt maturing in year two following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -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 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-13 -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 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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