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Summary of Significant Accounting Policies - Fair Value Measurements (Details) € in Thousands | Jun. 30, 2019 USD ($) | Jun. 30, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Jun. 30, 2018 EUR (€)
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Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items] |  |  |  |  |
Derivative, amount of hedged item | € |  | € 274,161 |  |  | € 179,881
Fair value measured on recurring basis | Quoted prices in active markets (Level 1) |  |  |  |  |
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items] |  |  |  |  |
Money Market Funds | $ 0 |  |  |  |
Time Deposits |  |  | $ 0 |  |
Trading securities | 9,744,000 |  | 10,248,000 |  |
Derivative Assets |  |  | 0 |  |
Interest Rate Swap Agreements Liabilities | 0 |  | 0 |  |
Fair value measured on recurring basis | Significant other observable inputs (Level 2) |  |  |  |  |
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items] |  |  |  |  |
Money Market Funds | 4,418,000 |  |  |  |
Time Deposits |  |  | 956,000 |  |
Trading securities | 622,000 |  | 505,000 |  |
Derivative Assets |  |  | 93,000 |  |
Interest Rate Swap Agreements Liabilities | 8,578,000 |  | 973,000 |  |
Fair value measured on recurring basis | Significant unobservable inputs (Level 3) |  |  |  |  |
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items] |  |  |  |  |
Money Market Funds | 0 |  |  |  |
Time Deposits |  |  | 0 |  |
Trading securities | 0 |  | 0 |  |
Derivative Assets |  |  | 0 |  |
Interest Rate Swap Agreements Liabilities | 0 |  | 0 |  |
Estimate of Fair Value Measurement | Fair value measured on recurring basis |  |  |  |  |
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items] |  |  |  |  |
Money Market Funds | 4,418,000 |  |  |  |
Time Deposits |  |  | 956,000 |  |
Trading securities | 10,366,000 |  | 10,753,000 |  |
Derivative Assets |  |  | 93,000 |  |
Interest Rate Swap Agreements Liabilities | 8,578,000 |  | 973,000 |  |
Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items] |  |  |  |  |
Notional amount of derivatives | $ 350,000,000 |  | 350,000,000 |  |
Long | Foreign exchange contracts |  |  |  |  |
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items] |  |  |  |  |
Notional amount of derivatives | € |  |  |  | € 29,000 |
Short | Foreign exchange contracts |  |  |  |  |
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items] |  |  |  |  |
Derivative, amount of hedged item |  |  | $ 33,374,000 |  |

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