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Schedule of Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 19, 2018 | Dec. 31, 2017 | Dec. 22, 2017 | Sep. 30, 2017
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Cash and cash equivalents | $ 109,044 |  | $ 176,274 |  | $ 137,584
Liabilities |  |  |  |  |
Senior notes |  | $ 100,000 |  | $ 300,000 |
USD Denominated Term Loan [Member] |  |  |  |  |
Liabilities |  |  |  |  |
USD denominated term loan | 641,875 |  | 194,063 |  |
Line of Credit [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Multicurrency revolving line of credit | 10,000 |  | 125,414 |  |
Reported Value Measurement [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents | 109,044 |  | 176,274 |  |
Restricted cash | 2,106 |  | 311,061 |  |
Foreign exchange forwards | 69 |  | 41 |  |
Liabilities |  |  |  |  |
Senior notes | 400,000 |  | 300,000 |  |
Foreign exchange forwards | 240 |  | 289 |  |
Reported Value Measurement [Member] | USD Denominated Term Loan [Member] |  |  |  |  |
Liabilities |  |  |  |  |
USD denominated term loan | 641,875 |  | 194,063 |  |
Reported Value Measurement [Member] | Line of Credit [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Multicurrency revolving line of credit | 10,000 |  | 125,414 |  |
Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative asset, noncurrent | 3,784 |  | 2,370 |  |
Reported Value Measurement [Member] | Interest Rate Cap [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative asset, noncurrent | 1,335 |  | 489 |  |
Reported Value Measurement [Member] | Currency Swap [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative asset, noncurrent | 2,449 |  | 0 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents | 109,044 |  | 176,274 |  |
Restricted cash | 2,106 |  | 311,061 |  |
Foreign exchange forwards | 69 |  | 41 |  |
Liabilities |  |  |  |  |
Senior notes | 383,000 |  | 301,125 |  |
Foreign exchange forwards | 240 |  | 289 |  |
Estimate of Fair Value Measurement [Member] | USD Denominated Term Loan [Member] |  |  |  |  |
Liabilities |  |  |  |  |
USD denominated term loan, fair value | 649,686 |  | 192,295 |  |
Estimate of Fair Value Measurement [Member] | Line of Credit [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Multicurrency revolving line of credit, fair value | 10,137 |  | 124,100 |  |
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative asset, noncurrent | 3,784 |  | 2,370 |  |
Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative asset, noncurrent | 1,335 |  | 489 |  |
Estimate of Fair Value Measurement [Member] | Currency Swap [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative asset, noncurrent | $ 2,449 |  | $ 0 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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