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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 19, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment upon adoption of ASU No. 2016-01			$ 0
Amounts reclassified from cumulative other comprehensive income to net income		$ 0	(5,082)	$ (2,795)
Restricted cash		15,095	16,083
Net cash provided by (used in) operating activities		$ 392,840	419,304	424,481
Cumulative Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment upon adoption of ASU No. 2016-01			(87,429)
Cumulative Other Comprehensive Income (Loss) | ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment upon adoption of ASU No. 2016-01	$ (86,573)
Amounts reclassified from cumulative other comprehensive income to net income	(841)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment upon adoption of ASU No. 2016-01			87,429
Retained Earnings | ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment upon adoption of ASU No. 2016-01	86,573
Amounts reclassified from cumulative other comprehensive income to net income	$ 841
Restatement Adjustment | ASU 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities			$ 12,254	$ (2,326)
Scenario, Forecast | Minimum | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset					$ 5,000
Lease liability					5,000
Scenario, Forecast | Maximum | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset					7,000
Lease liability					$ 7,000

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Present value of lessee's discounted obligation for lease payments from operating lease.

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