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Derivatives - Interest Rate Swaps-Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Notional amount outstanding | $ 968,135 |  | $ 1,030,642
Interest Rate Fair Value Hedge Derivative at Fair Value Net | 49,436 |  | 55,422
Realized ineffectiveness of interest rate swaps | $ 60 | $ 121 |
Swaps breakage cost |  | $ 10,192 |
Maturity of interest rate swaps qualifying for cash flow hedge | The maturity of these interest rate swaps range between June 2018 and January 2021. |  |
Accumulated Other Comprehensive Loss to settlements on interest rate swaps | $ 27,181 |  |
Notional amount outstanding | 212,486 |  | 217,533
Interest Rate Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value | $ 16,149 |  | $ 18,509
Maturity of interest rate swaps that do not qualify for cash flow hedge | The maturity of these interest rate swaps range between February 2017 and August 2020. |  |

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- Definition Custom Element. + References No definition available. + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the interest expense amount of the cash flow hedges' ineffectiveness. + References No definition available. + Details
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- Definition The amount paid to counterparty for early termination of derivatives. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Fair value as of the balance sheet date of all derivative liabilities not designated as 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)(2) -URI http://asc.fasb.org/extlink&oid=56946850&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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