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Derivative Financial Instruments (Details Textual) | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended | 1 Months Ended |  | 0 Months Ended |
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Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Sep. 30, 2013 USD ($) agreement | Sep. 30, 2012 USD ($) | Dec. 31, 2012 USD ($) | Sep. 30, 2013 Interest Rate Swap USD ($) | Sep. 30, 2013 Interest Rate Swap AUD | Sep. 30, 2013 Fair Value Hedging Interest Rate Swap USD ($) | Sep. 30, 2013 Fair Value Hedging Interest Rate Swap USD ($) | Sep. 30, 2013 Minimum [Member] | Sep. 30, 2013 Maximum [Member] | Oct. 31, 2013 Subsequent Event Interest Rate Swap USD ($) | Sep. 30, 2013 7.75% Senior Notes | Sep. 30, 2013 7.75% Senior Notes Senior Notes | Nov. 03, 2013 7.75% Senior Notes Senior Notes Subsequent Event USD ($) agreement | Oct. 03, 2013 7.75% Senior Notes Senior Notes Subsequent Event USD ($)
Interest Rate Swaps [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of interest rates swap agreements |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  | 4 |
Notional amount coincide with the terms of the non-recourse debt |  |  |  |  |  | $ 100,000,000.0 | 50,900,000.0 |  |  |  |  |  |  |  |  |
Interest rate | 7.75% |  | 7.75% |  |  |  |  |  |  |  |  |  | 7.75% | 7.75% |  |
Variable interest rate payment to the same counterparties |  |  |  |  |  |  |  |  |  | 4.16% | 4.29% |  |  |  |  |
Gains (loss) recognized and recorded in earnings related to fair value hedge |  |  |  |  |  |  |  | 600,000 | 2,200,000 |  |  |  |  |  |  |
Fair value of the swap assets included as Other Non-Current Assets |  |  |  |  | 6,200,000 |  |  |  |  |  |  |  |  |  | 4,000,000 |
Ineffective portion of Fair value interest rate swap | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement of notional amount of interest rate swaps |  |  |  |  |  |  |  |  |  |  |  | 5,100,000 |  |  |  |
Proceeds from settlement of notional amount derivative, accrued interest |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |
Repurchased amount of aggregate principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 209,100,000
Fixed interest rate on cash flow interest rate derivative | 9.70% |  | 9.70% |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized loss recognized in the periods and recorded in accumulated other comprehensive income, net of tax | 0 |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | 500,000 |  | 500,000 |  | 700,000 |  |  |  |  |  |  |  |  |  |  |
Ineffective portion of Cash Flow Hedge interest rate swap | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Proceeds from Settlement of Notional Amount Derivative + References No definition available. + Details
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- Definition Proceeds from Settlement of Notional Amount Derivative, Accrued Interest + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of all derivatives designated as interest rate fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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