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Derivative Financial Instruments Derivative Financial Instruments Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2012 USD ($)
Derivative [Line Items] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (170,478,000) | $ (229,327,000) |  |  |
Long-term Debt | 319,477,000 |  |  |  |
Secured Debt [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Long-term Debt | 619,477,000 | 305,292,000 |  |  |
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Nonderivative Instruments [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (14,380,000) | $ (14,380,000) | $ (14,380,000) | $ (14,380,000) |
Number of Counterparties [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Description of Derivative Activity Volume | three | three |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Long-term Debt | $ 254,100,000 |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of Interest Rate Derivatives Held | 1 |  |  |  | 6
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ 700,000 |  |  |  |
Derivative, Notional Amount |  |  | $ 214,000,000 |  | $ 200,000,000
Derivative, Fixed Interest Rate |  |  | 1.42% |  | 1.00%
Interest Rate Cap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of Interest Rate Derivatives Held | 3 |  |  |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ 300,000 |  |  |  |
Derivative, Cap Interest Rate | 2.00% |  | 2.00% |  |
Derivative, Notional Amount | $ 100,000,000 |  | $ 100,000,000 |  |
Derivative Purchase Price |  |  | $ 1,700,000 |  |
Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Number of Instruments Held |  | 2 |  |  |
Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Description of Derivative Activity Volume | 54 |  |  |  |
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | $ 158,000 |  |  |  |
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | $ 39,500,000 |  |  |  |

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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 in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: 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=84228862&loc=d3e637-108580 Reference 2: 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=84228862&loc=d3e681-108580 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=84228862&loc=SL7669686-108580 + Details
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