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Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | $ 4,289 | $ (3,805) | $ 13,794 | $ (3,873) |
Amount reclassified from accumulated other comprehensive loss | (1,415) | (3,071) | (3,553) | (5,726) |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | $ 2,500 |  |
Derivative $300M Term [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Apr. 03, 2017 |  |
Derivative, Maturity Date |  |  | Dec. 02, 2020 |  |
Derivative, Notional Amount | $ 300,000 |  | $ 300,000 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR with Floor |  |
Derivative, Fixed Interest Rate | 1.824% |  | 1.824% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ (5,890) |  | $ (5,890) |  | $ (1,804)
Derivatives 200K @ 1.04770% and 65K @ 1.07000% [Member] [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Aug. 01, 2016 |  |
Derivative, Maturity Date |  |  | Jan. 05, 2022 |  |
Derivative, Notional Amount | $ 265,000 |  | $ 265,000 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR with Floor |  |
Derivative, Fixed Interest Rate | 1.053% |  | 1.053% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ (15,022) |  | $ (15,022) |  | (10,744)
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 |  | $ 20,000 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate | 1.3025% |  | 1.3025% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ (1,243) |  | $ (1,243) |  | (801)
Derivative $33M Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Dec. 01, 2016 |  |
Derivative, Maturity Date |  |  | Nov. 01, 2023 |  |
Derivative, Notional Amount | $ 33,000 |  | $ 33,000 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate | 1.49% |  | 1.49% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ (2,002) |  | $ (2,002) |  | (1,166)
Derivative @ 2.36600% 37.5K [Member] [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Jun. 02, 2017 |  |
Derivative, Maturity Date |  |  | Jun. 02, 2027 |  |
Derivative, Notional Amount | $ 37,500 |  | $ 37,500 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR with Floor |  |
Derivative, Fixed Interest Rate | 2.366% |  | 2.366% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ (1,315) |  | $ (1,315) |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  |  |  | 177
Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | 8,400 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | (25,472) |  | (25,472) |  | (14,515)
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  |  |  | 177
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | (25,472) |  | (25,472) |  | (14,515)
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  |  |  | 177
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net | 25,472 |  | 25,472 |  | $ 14,338
Parent Company [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 4,289 | (3,805) | 13,794 | (3,873) |
Interest Expense | $ 38,074 | $ 35,407 | $ 74,859 | $ 62,606 |

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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + 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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