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Fair Value (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Fair Value [Abstract] |  |  |  |  |
Interest rate swap notional amount | $ 168,200 |  | $ 168,200 |  | $ 172,500
Fixed interest rate | 1.4935% |  | 1.4935% |  |
Fair value of interest rate swap | $ 4,700 |  | $ 4,700 |  | $ 0
Unrealized loss on interest rate swap |  |  | (4,700) |  |
Unrealized loss on interest rate swap, net of tax | $ (667) | $ 0 | $ (2,899) | $ 0 |

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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 Fair value as of the balance sheet date of all interest rate derivative liabilities 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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