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Derivatives (Details) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) instrument | Dec. 31, 2014 USD ($) | Dec. 31, 2013 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 | $ 25,046,000 |  |  |  |  |  |  |
Interest expense | 90,008,000 | $ 85,510,000 | $ 85,822,000 |  |  |  |  |
Interest rate hedges gain (loss) to be reclassified into interest expense over next 12 months | $ (2,851,000) |  |  |  |  |  |  |
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 | $ 1,902,000 | $ 1,129,000 | $ 438,000 |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  |  |  |  |  |  |  | 2
Notional amount of interest rate hedges terminated |  |  |  |  |  |  |  | $ 100,000,000
Treasury locks designated as cash flow hedges, fair value |  |  |  |  |  |  |  | 3,260,000
Treasury locks designated as cash flow hedges, other comprehensive income |  |  |  |  |  |  |  | $ 3,228,000
Treasury Locks |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  |  |  |  |  |  | 2 |
Notional amount of interest rate hedges terminated |  |  |  |  |  |  | $ 150,000,000 |
Treasury locks designated as cash flow hedges, fair value |  |  |  |  |  |  | 5,300,000 |
Treasury locks designated as cash flow hedges, other comprehensive income |  |  |  |  |  |  | $ 5,218,000 |
Forward Swap |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  |  |  | 4,000 | 3 | 4 |  |
Notional amount of interest rate hedges terminated |  |  |  | $ 300,000,000 | $ 225,000,000 | $ 240,000,000 |  |
Treasury locks designated as cash flow hedges, fair value |  |  |  | 13,369,000 | 6,312,000 | 3,156,000 |  |
Treasury locks designated as cash flow hedges, other comprehensive income |  |  |  | $ 13,369,000 | $ 6,312,000 | $ 3,141,000 |  |

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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 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=36458714&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=36458714&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=36458714&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=36458714&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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- Definition Fair value of all liability derivatives designated as cash flow 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 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve 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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