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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statement of Changes in Stockholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (loss) | $ (4,698) | $ (13,318) | $ (3,258) | $ (42,313)
Less: amount of (loss) gain reclassified in interest expense | (2,669) | (4,586) | (6,008) | (9,207)
Total change in other comprehensive income (loss) for unrealized gains (losses) on derivatives, before income tax benefit (expense) | $ (2,029) | $ (8,732) | $ 2,750 | $ (33,106)

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- Definition Amount before tax, after reclassification adjustments, 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 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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