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Derivative Financial Instruments - Australia Ravenhall (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2014 Ravenhall, Australia USD ($) | Dec. 31, 2013 Ravenhall, Australia USD ($) | Sep. 30, 2014 Ravenhall, Australia Interest Rate Swap USD ($) | Sep. 30, 2014 Ravenhall, Australia Interest Rate Cap USD ($) | Sep. 30, 2014 Ravenhall, Australia Interest Rate Cap USD ($) | Sep. 30, 2014 Ravenhall, Australia Other Noncurrent Liabilities USD ($) | Sep. 30, 2014 Ravenhall, Australia Other Noncurrent Assets Interest Rate Cap USD ($) | Sep. 30, 2014 Ravenhall, Australia Design and construction phase Interest Rate Swap USD ($) | Sep. 30, 2014 Ravenhall, Australia Design and construction phase Interest Rate Swap AUD | Sep. 30, 2014 Ravenhall, Australia Operating phase Interest Rate Swap AUD | Sep. 30, 2014 Ravenhall, Australia Cash Flow Hedge USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate on derivative |  |  |  |  |  |  |  |  |  |  |  | 3.34% | 3.34% | 4.21% |
Notional amount coincide with the terms of the non-recourse debt |  |  |  |  |  |  | $ 424,000,000 |  |  |  |  | $ 74,000,000 | 85,000,000 | 486,000,000 |
Unrealized losses, net of tax, related to cash flow hedge | (4,877,000) | (3,000) | (4,858,000) | 138,000 |  |  |  |  |  |  |  |  |  |  | (4,900,000)
Fair value of the swap liability |  |  |  |  |  |  |  |  |  | (7,000,000) |  |  |  |  |
Ineffective portion of Cash Flow Hedge interest rate swap |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |
Payments on non-recourse debt |  |  | 4,511,000 | 27,153,000 |  |  |  |  | 1,700,000 |  |  |  |  |  |
Loss related to decline in derivative fair value |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |
Interest rate swap asset value |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |  |

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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 Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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- Definition The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + 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=35706170&loc=SL5624163-113959 + Details
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- Definition Fair value as of the balance sheet date of all derivative assets 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 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and 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 Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 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=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 4: 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=35706170&loc=SL5624171-113959 + Details
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- Definition The cash outflow for the payment of other borrowing not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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