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Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease assets | $ 952,890 |  |  |
Present value of lease liabilities | 969,105 |  |  |
Direct costs of leased and rented property or equipment | $ 13,000 |  |  |
Cumulative effect on retained earnings, net of tax |  |  | $ 28,944 | $ 5,074
Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect on retained earnings, net of tax |  |  | $ 28,944 | $ 5,074
Retained Earnings | ASU 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect on retained earnings, net of tax |  | $ 28,944 |  |

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