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Derivatives (Details) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) instrument | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Oct. 31, 2015 USD ($) instrument | May 31, 2014 USD ($) instrument | Apr. 30, 2013 USD ($) instrument | Jun. 30, 2011 USD ($) instrument | Sep. 30, 2007 USD ($) instrument
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Fair value of interest rate hedges recognized in other comprehensive income |  | $ 8,899,000 |  |  |  |  |  |  |
Interest expense |  | 96,352,000 | $ 90,008,000 | $ 85,510,000 |  |  |  |  |
Interest rate hedges loss to be reclassified into interest expense over next 12 months |  | $ 1,746,000 |  |  |  |  |  |  |
Number of derivative financial instruments outstanding | instrument |  | 0 |  |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Interest expense |  | $ 2,802,000 | $ 1,902,000 | $ 1,129,000 |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  |  |  |  |  |  |  |  | 2
Treasury Locks |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  |  |  |  |  |  |  | 2 |
Aggregate Notional Amount |  |  |  |  |  |  |  | $ 150,000,000 | $ 100,000,000
Liability (Asset) Fair Value When Terminated |  |  |  |  |  |  |  | 5,300,000 | 3,260,000
Liability amount from termination of hedge agreement, comprehensive income | [1] |  |  |  |  |  |  | $ 5,218,000 | $ 3,228,000
Forward Swap |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  | 2,000 |  |  | 4,000 | 3 | 4 |  |
Aggregate Notional Amount |  | $ 180,000,000 |  |  | $ 300,000,000 | $ 225,000,000 | $ 240,000,000 |  |
Liability (Asset) Fair Value When Terminated |  | (13,352,000) |  |  | 13,369,000 | 6,312,000 | 3,156,000 |  |
Liability amount from termination of hedge agreement, comprehensive income | [1] | $ (13,345,000) |  |  | $ 13,369,000 | $ 6,312,000 | $ 3,141,000 |  |
[1] | The amount reported in accumulated other comprehensive income will be reclassified to interest expense as interest payments are made on the related notes payable.

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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