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Derivative Financial Instruments Narrative (Details) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2018 USD ($) contracts | Apr. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Net unrealized loss on hedging instruments |  | $ 185,246,000 |  | $ 170,478,000 |  |
Total debt |  | 651,875,000 |  |  |  |
Debt Instrument, interest rate, stated percentage |  |  | 1.38% |  |  |
Secured Debt [Member] |  |  |  |  |  |
Total debt |  | 1,051,875,000 |  | 619,477,000 |  |
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Nonderivative Instruments [Member] |  |  |  |  |  |
Net unrealized loss on hedging instruments |  | $ 14,380,000 |  | $ 14,380,000 | $ 14,380,000 | $ 14,380,000
Number of Counterparties [Member] |  |  |  |  |  |
Derivative counterparties |  | 5 |  | 3 |  |
Interest Rate Swap [Member] |  |  |  |  |  |
Number of interest rate derivatives held |  | 1 |  |  |  |
Derivative, notional amount |  | $ 214,000,000 |  |  |  |
Pay fixed interest rate in interest rate swap |  | 1.42% |  |  |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net |  | $ 2,100,000 |  |  |  |
Interest Rate Cap [Member] |  |  |  |  |  |
Number of interest rate derivatives held |  | 3 |  |  |  |
Derivative, notional amount |  | $ 100,000,000 |  |  |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net |  | $ (100,000) |  |  |  |
Derivative purchase price | $ 1,700,000 |  |  |  |  |
Derivative, cap interest rate |  | 2.00% |  |  |  |
Currency Swap [Member] |  |  |  |  |  |
Derivative, notional amount |  |  | $ 56,000,000.0 |  |  |
Foreign currency cash flow hedge gain (loss) to be reclassified during next 12 months |  |  | $ 1,700,000 |  |  |
Forward Contracts [Member] |  |  |  |  |  |
Number of foreign exchange contracts | contracts |  | 52 |  |  |  |
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member] |  |  |  |  |  |
Derivative, notional amount |  | $ 183,000 |  |  |  |
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member] |  |  |  |  |  |
Derivative, notional amount |  | 55,500,000 |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member] |  |  |  |  |  |
Total debt |  | $ 652,000,000.0 |  |  |  |

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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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