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Derivatives and Hedging Activities Derivatives in Cash Flow Hedging Relationships (Interest Rate Swaps) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Debt_Instrument | Dec. 31, 2016 USD ($) Debt_Instrument | Dec. 31, 2015 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in OCI on derivatives | $ 2,770 | $ 6,979 | $ (3,128)
Amount of loss reclassified from AOCI into interest expense | 1,810 | $ 3,586 | $ 3,150
Interest rate derivative liabilities, at fair value | 100 |  |
Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Reversal of cumulative ineffectiveness gain due to adoption of new accounting pronouncement | 1,300 |  |
Interest Rate Swap | Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative instruments, gain (loss) reclassification from AOCI to income, estimated net amount to be transferred | $ 1,500 |  |
Count | Debt_Instrument | 6 | 4 |
Notional amount | $ 992,000 | $ 642,000 |
Future | Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Count | Debt_Instrument |  | 1 |
Notional amount |  | $ 255,000 |
Minimum | Interest Rate Swap | Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fixed LIBOR | 1.20% | 1.20% |
Maximum | Interest Rate Swap | Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fixed LIBOR | 2.20% | 1.50% |

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying 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 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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