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Derivative Instruments - Derivative Narrative (Details) (USD $) | 12 Months Ended |  | 9 Months Ended |  |  | 3 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Oct. 10, 2012 Interest Rate Swap [Member] Cash Flow Hedging [Member] | Oct. 10, 2012 Interest Rate Swap [Member] Designated as Hedging Instrument [Member] | Dec. 31, 2011 Interest Rate Swap [Member] Not Designated as Hedging Instrument [Member] July 2011 Maturity [Member] | Dec. 31, 2011 Interest Rate Swap [Member] Not Designated as Hedging Instrument [Member] Q1 2011 Maturity [Member] | Dec. 31, 2012 Senior Secured Term Loan A [Member] Interest Rate Swap [Member] Cash Flow Hedging [Member] | Dec. 31, 2012 Senior Secured Term Loan B [Member] Interest Rate Swap [Member] Cash Flow Hedging [Member] | Dec. 31, 2012 Interest Rate Swap [Member] Designated as Hedging Instrument [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  |  |  |  |  |  |  |  | $ 500,000
Notional Amount of Cash Flow Hedge Instruments |  |  |  | 100,000,000 |  |  |  | 175,000,000 | 150,000,000 |
Derivative, Fixed Interest Rate |  |  |  | 1.80% |  |  |  | 0.738% | 2.0525% |
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion |  |  |  |  | 1,000,000 |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 1,000,000 | 100,000 | 900,000 |  | 600,000 |  |  |  |  |
Notional Amount of Other Derivatives Not Designated as Hedging Instruments |  |  |  |  |  | $ 125,000,000 | $ 75,000,000 |  |  |

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 2 -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. + Details
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- Definition Aggregate notional amount of all derivatives designated as cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Aggregate notional amount of all derivatives not designated as a hedging instrument. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 25 -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 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e640-108580 + Details
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