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Long-Term Debt (Senior Notes) (Details) |  |  |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 18, 2018 USD ($) | Sep. 11, 2017 USD ($) | Jan. 15, 2016 USD ($) | Jun. 09, 2015 USD ($) | Jan. 31, 2013 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 18, 2018 EUR (€) | Sep. 11, 2017 EUR (€) | Jun. 09, 2015 EUR (€) | Dec. 31, 2014 USD ($) | Jan. 17, 2006 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 890,000 | $ 1,478,000 | $ 1,336,000 |  |  |  |  |
3.85% senior notes, payable February 1, 2023; interest payable semiannually |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debts |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 3.85% |  |  |  |  |  |  |  |
Floating Rate Notes, payable May 18, 2020; interest payable quarterly |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debts | € |  |  |  |  |  |  |  |  | € 300,000,000 |  |  |  |
Debt issuance costs | $ 890,000 |  |  |  |  |  |  |  |  |  |  |  |
2.00% senior notes, payable January 14, 2022; interest payable annually |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debts | € |  |  |  |  |  |  |  |  |  |  | € 500,000,000 |  |
Debt issuance costs |  |  |  | $ 4,218,000 |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
Floating Rate Notes, payable September 11, 2019, interest payable quarterly |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debts | € |  |  |  |  |  |  |  |  |  | € 300,000,000 |  |  |
Debt issuance costs |  | $ 911,000 |  |  |  |  |  |  |  |  |  |  |
6.125% notes, payable January 15, 2016; interest payable semiannually |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debts |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000
Interest rate percentage |  |  |  |  |  |  |  |  |  |  |  |  | 6.125%
Amount of debt repurchased |  |  |  |  |  |  |  |  |  |  |  | $ 254,445,000 |
Remaining principal paid in period |  |  | $ 645,555,000 |  |  |  |  |  |  |  |  |  |
Euro Interbank Offered Rate (EURIBOR) | Floating Rate Notes, payable May 18, 2020; interest payable quarterly |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on debt instrument | 0.30% |  |  |  |  |  |  |  |  |  |  |  |
Euro Interbank Offered Rate (EURIBOR) | Floating Rate Notes, payable September 11, 2019, interest payable quarterly |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on debt instrument |  | 0.30% |  |  |  |  |  |  |  |  |  |  |

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