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Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details) $ in Thousands | Jan. 16, 2018 EUR (€) | Dec. 20, 2013 AUD ($) loan | Jun. 30, 2018 USD ($) | Apr. 23, 2018 USD ($) | Dec. 31, 2017 USD ($) swap | Dec. 31, 2017 EUR (€) swap | Jan. 31, 2014 AUD ($) | Dec. 31, 2010 USD ($) swap
--- | --- | --- | --- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |  |  |  |
Fair value of derivative assets |  |  | $ 15,410 |  | $ 48,186 |  |  |
Lines of credit | Term Loan Two | Syndicated Facility Agreement |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Borrowing under credit facility |  | $ 22,500,000 |  |  |  |  |  |
THINK | Lines of credit | Term Loan | Syndicated Facility Agreement |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Borrowing under credit facility |  | $ 45,000,000 | 33,210 |  |  |  |  |
Number of term loans (loan) | loan |  | 2 |  |  |  |  |  |
Days to enter into interest rate swap (within) |  | 45 days |  |  |  |  |  |
Required percentage of term loan to be converted to fixed interest rate (at least) |  | 50.00% |  |  |  |  |  |
THINK | Lines of credit | Term Loan One | Syndicated Facility Agreement |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Borrowing under credit facility |  | $ 22,500,000 |  |  |  |  |  |
Derivatives not designated as hedging instruments: | Contingent redemption features - Series A Preferred Stock |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Fair value of derivative assets |  |  | 0 | $ 140,300 | 42,140 |  |  |
Probability of conversion |  |  |  | 100.00% |  |  |  |
Derivatives not designated as hedging instruments: | Interest rate swaps | THINK |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  | $ 22,500,000 |
Variable interest converted |  |  | 16,605 |  |  |  | $ 22,500,000 |
Derivative, fixed interest rate |  |  |  |  |  |  | 3.86% |
Derivative liability, noncurrent |  |  | 72 |  | $ 179 |  |  |
Derivatives not designated as hedging instruments: | Foreign Exchange Forward |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, notional amount | € |  |  |  |  |  | € 200,000,000 |  |
Number of currency derivatives held (derivative instrument) | swap |  |  |  |  | 6 | 6 |  |
Unrealized gain (loss) on derivatives | € | € (9,960,000) |  |  |  |  |  |  |
Derivatives not designated as hedging instruments: | Cross currency and interest rate swaps |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative liability, noncurrent |  |  | 7,644 |  | $ 7,939 |  |  |
Derivatives not designated as hedging instruments: | Cross currency and interest rate swaps | Chile |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  | $ 31,000
Derivative liability, noncurrent |  |  | $ 7,644 |  | $ 7,939 |  |  |
Derivative, number of instruments held (derivative instrument) | swap |  |  |  |  |  |  |  | 4
Derivatives not designated as hedging instruments: | Cross Currency Interest Rate Contract, Maturing December 1, 2024 | Chile |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, number of instruments held (derivative instrument) | swap |  |  |  |  |  |  |  | 1
Derivatives not designated as hedging instruments: | Cross Currency Interest Rate Contract, Maturing July 1, 2025 | Chile |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, number of instruments held (derivative instrument) | swap |  |  |  |  |  |  |  | 3

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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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