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Derivatives (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | $ 2,717,000 | $ (39,000) | $ 16,511,000 | $ (3,911,000) |
Amount reclassified from accumulated other comprehensive loss | (1,148,000) | (2,329,000) | (4,701,000) | (8,054,000) |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | $ 600,000 |  |
Derivative $300M Term [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Apr. 03, 2017 |  |
Derivative, Maturity Date |  |  | Dec. 02, 2020 |  |
Derivative, Notional Amount | $ 300,000,000 |  | $ 300,000,000 |  |
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 | $ (6,410,000) |  | $ (6,410,000) |  | $ (1,804,000)
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 | $ 265,000,000 |  | $ 265,000,000 |  |
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 | $ (15,286,000) |  | $ (15,286,000) |  | (10,744,000)
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 Asset at Fair Value | $ (1,310,000) |  | $ (1,310,000) |  | (801,000)
Derivative $33M Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Dec. 01, 2016 |  |
Derivative, Maturity Date |  |  | Nov. 01, 2023 |  |
Derivative, Notional Amount | $ 33,000,000 |  | $ 33,000,000 |  |
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 | $ (2,151,000) |  | $ (2,151,000) |  | (1,166,000)
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 | $ 37,500,000 |  | $ 37,500,000 |  |
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 | $ (1,645,000) |  | $ (1,645,000) |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  |  |  | 177,000
Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | 7,900,000 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | (26,802,000) |  | (26,802,000) |  | (14,515,000)
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  |  |  | 177,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | (26,802,000) |  | (26,802,000) |  | (14,515,000)
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  |  |  | 177,000
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net | 26,802,000 |  | 26,802,000 |  | $ 14,338,000
Parent Company [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 2,717,000 | (39,000) | 16,511,000 | (3,911,000) |
Interest Expense | $ 36,618,000 | $ 34,679,000 | $ 111,477,000 | $ 97,285,000 |

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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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