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Derivative Instruments, Hedging Activities and Fair Value (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2021 | Dec. 31, 2018 | Jan. 31, 2017 | Dec. 31, 2016
Foreign Currency Derivatives |  |  |  |  |  |  |  |
Pre-tax net gains (losses) on certain loans designated as hedges of net investments in foreign subsidiaries | $ 7,700 | $ (16,400) | $ 9,500 | $ (20,300) |  |  |  |
Proceeds from cross-currency interest rate swap termination |  |  | 0 | 16,625 |  |  |  |
Foreign currency forward exchange contracts |  |  |  |  |  |  |  |
Foreign Currency Derivatives |  |  |  |  |  |  |  |
U.S. Dollar Equivalent | 608,241 |  | 608,241 |  |  |  |  | $ 600,883
Recognized Gain (Loss) |  |  | (13,985) | 1,394 |  |  |  |
Foreign currency forward exchange contracts | British pounds sterling | Sell |  |  |  |  |  |  |  |
Foreign Currency Derivatives |  |  |  |  |  |  |  |
U.S. Dollar Equivalent | 69,228 |  | 69,228 |  |  |  |  | 55,120
Recognized Gain (Loss) |  |  | (1,516) | (228) |  |  |  |
Foreign currency forward exchange contracts | British pounds sterling | Buy |  |  |  |  |  |  |  |
Foreign Currency Derivatives |  |  |  |  |  |  |  |
U.S. Dollar Equivalent | 9,788 |  | 9,788 |  |  |  |  | 827
Recognized Gain (Loss) |  |  | 108 | (14) |  |  |  |
Foreign currency forward exchange contracts | Euros | Sell |  |  |  |  |  |  |  |
Foreign Currency Derivatives |  |  |  |  |  |  |  |
U.S. Dollar Equivalent | 304,566 |  | 304,566 |  |  |  |  | 326,797
Recognized Gain (Loss) |  |  | (14,233) | 628 |  |  |  |
Foreign currency forward exchange contracts | Euros | Buy |  |  |  |  |  |  |  |
Foreign Currency Derivatives |  |  |  |  |  |  |  |
U.S. Dollar Equivalent | 163,183 |  | 163,183 |  |  |  |  | 171,578
Recognized Gain (Loss) |  |  | 2,482 | (468) |  |  |  |
Foreign currency forward exchange contracts | Other currencies | Sell |  |  |  |  |  |  |  |
Foreign Currency Derivatives |  |  |  |  |  |  |  |
U.S. Dollar Equivalent | 47,184 |  | 47,184 |  |  |  |  | 43,455
Recognized Gain (Loss) |  |  | (880) | 1,477 |  |  |  |
Foreign currency forward exchange contracts | Other currencies | Buy |  |  |  |  |  |  |  |
Foreign Currency Derivatives |  |  |  |  |  |  |  |
U.S. Dollar Equivalent | $ 14,292 |  | 14,292 |  |  |  |  | $ 3,106
Recognized Gain (Loss) |  |  | $ 54 | $ (1) |  |  |  |
Term Loan Facility, Fixed-Rate | Term Loan |  |  |  |  |  |  |  |
Foreign Currency Derivatives |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 300,000 |
LIBOR | Scenario, Forecast | Term Loan Facility, Fixed-Rate | Subsequent Event | Term Loan |  |  |  |  |  |  |  |
Foreign Currency Derivatives |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.71% | 1.65% |  |

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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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