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Derivatives (Details) | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) instrument | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) instrument | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) instrument | Oct. 31, 2015 USD ($) instrument | May 31, 2014 USD ($) instrument | Apr. 30, 2013 USD ($) instrument | Jun. 30, 2011 USD ($) instrument | Sep. 30, 2007 USD ($) instrument
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Notional Amount | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |  |  |
Liability (Asset) Fair Value When Terminated | 7,690,000 |  | 7,690,000 |  |  |  |  |  |  |
Fair value of interest rate hedges recognized in other comprehensive income | 15,193,000 |  | 15,193,000 |  |  |  |  |  |  |
Interest expense | 28,204,000 | $ 24,257,000 | 82,092,000 | $ 71,923,000 |  |  |  |  |  |
Interest rate hedges gain (loss) to be reclassified into interest expense over next 12 months | $ (2,131,000) |  | $ (2,131,000) |  |  |  |  |  |  |
Treasury Lock |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  |  |  |  |  |  |  |  | 2 | 2
Aggregate Notional Amount |  |  |  |  |  |  |  |  | $ 150,000,000 | $ 100,000,000
Liability (Asset) Fair Value When Terminated |  |  |  |  |  |  |  |  | 5,300,000 | 3,260,000
Fair Value Deferred In Other Comprehensive Income |  |  |  |  |  |  |  |  | $ 5,218,000 | $ 3,228,000
Forward Swap |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument | 2 |  | 2 |  | 2 | 4 | 3 | 4 |  |
Aggregate Notional Amount | $ 250,000,000 |  | $ 250,000,000 |  | $ 180,000,000 | $ 300,000,000 | $ 225,000,000 | $ 240,000,000 |  |
Liability (Asset) Fair Value When Terminated | 7,690,000 |  | 7,690,000 |  |  | 13,369,000 | 6,312,000 | 3,156,000 |  |
Liability (Asset) Fair Value When Terminated |  |  |  |  | (13,352,000) |  |  |  |  |
Fair Value Deferred In Other Comprehensive Income | $ 7,688,000 |  | 7,688,000 |  | $ (13,345,000) | $ 13,369,000 | $ 6,312,000 | $ 3,141,000 |  |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest expense |  |  | $ 1,394,000 | $ 2,122,000 |  |  |  |  |  |

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