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Derivatives (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 14, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jul. 13, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net |  | $ (9,846,000) | $ 18,376,000 | $ (26,631,000) | $ 4,494,000 |  |
Amount reclassified from accumulated other comprehensive loss |  | (2,500,000) | (2,250,000) | (4,952,000) | (4,500,000) |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net |  | 0 | $ 0 | 0 | $ 0 |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  |  | 10,000,000 |  |  |
Assets [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | 220,000,000 |  | $ 220,000,000 |  |  |
Derivative @ 2.196% 28.1M [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  | Oct. 16, 2013 |  |  |
Derivative, Maturity Date |  |  |  | Oct. 16, 2020 |  |  |
Derivative, Notional Amount |  | $ 28,100,000 |  | $ 28,100,000 |  |  |
Derivative, Description of Variable Rate Basis |  |  |  | 1 Month LIBOR |  |  |
Derivative, Fixed Interest Rate |  | 2.196% |  | 2.196% |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  | $ (1,643,000) |  | $ (1,643,000) |  |  | $ (898,000)
Derivative @ 3.488% 20K [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  | Jun. 15, 2017 |  |  |
Derivative, Maturity Date |  |  |  | Jun. 15, 2027 |  |  |
Derivative, Early Termination Date |  |  |  | Dec. 15, 2017 |  |  |
Derivative, Notional Amount |  | $ 20,000,000 |  | $ 20,000,000 |  |  |
Derivative, Description of Variable Rate Basis |  |  |  | 3 Month LIBOR |  |  |
Derivative, Fixed Interest Rate |  | 3.4875% |  | 3.4875% |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  | $ (3,746,000) |  | $ (3,746,000) |  |  | (1,798,000)
Derivative @ 3.48% 100K [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  | Jun. 15, 2017 |  |  |
Derivative, Maturity Date |  |  |  | Jun. 15, 2027 |  |  |
Derivative, Early Termination Date |  |  |  | Dec. 15, 2017 |  |  |
Derivative, Notional Amount |  | $ 100,000,000 |  | $ 100,000,000 |  |  |
Derivative, Description of Variable Rate Basis |  |  |  | 3 Month LIBOR |  |  |
Derivative, Fixed Interest Rate |  | 3.48% |  | 3.48% |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  | $ (18,660,000) |  | $ (18,660,000) |  |  | (8,922,000)
Swap [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  |  | $ 8,400,000 |  |  |
Derivative @ 3.48% 100K 2 [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  | Jun. 15, 2017 |  |  |
Derivative, Maturity Date |  |  |  | Jun. 15, 2027 |  |  |
Derivative, Early Termination Date |  |  |  | Dec. 15, 2017 |  |  |
Derivative, Notional Amount |  | $ 100,000,000 |  | $ 100,000,000 |  |  |
Derivative, Description of Variable Rate Basis |  |  |  | 3 Month LIBOR |  |  |
Derivative, Fixed Interest Rate |  | 3.48% |  | 3.48% |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  | $ (18,660,000) |  | $ (18,660,000) |  |  | (8,921,000)
Derivative @ 1.30250% 20.0M [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  | Apr. 07, 2016 |  |  |
Derivative, Maturity Date |  |  |  | Apr. 01, 2023 |  |  |
Derivative, Notional Amount |  | $ 20,000,000 |  | $ 20,000,000 |  |  |
Derivative, Description of Variable Rate Basis |  |  |  | 1 Month LIBOR |  |  |
Derivative, Fixed Interest Rate |  | 1.3025% |  | 1.3025% |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  | $ (383,000) |  | $ (383,000) |  |  | 0
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  | (43,092,000) |  | (43,092,000) |  |  | (20,539,000)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  | $ (43,092,000) |  | $ (43,092,000) |  |  | $ (20,539,000)
2017 Debt issuance [Member] | Derivative [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  | 3.48% |  | 3.48% |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring | $ 40,600,000 |  |  |  |  |  |
Subsequent Event [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notice of Repayment of Unsecured Debt, Subsequent to Period End Date |  |  |  |  |  | $ 300,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.875% |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 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 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=56946850&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=56946850&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + 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) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Reference to the index or unit of measurement for the underlying which establishes the pricing terms of the derivative instrument. For example, the basis on the underlying for a natural gas futures contract might be the NYMEX price per million British thermal units (MMBtu). + References No definition available. + Details
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- Definition The amount of loss reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period. + 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 (e) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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