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Recently Issued Accounting Standards Recently Issued Accounting Standards (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Increase (decrease) in restricted cash and cash equivalents, operating activities   $ 0
Increase (decrease) in restricted cash and cash equivalents, investing activities   0
Increase (decrease) in restricted cash and cash equivalents, financing activities   0
Net increase in cash, cash equivalents and restricted cash [1] $ 151,486 98,847
Cash, cash equivalents and restricted cash at beginning of period [1] 612,677 640,218
Cash, cash equivalents and restricted cash at end of period [1] $ 764,163 739,065
Accounting Standards Update 2016-18 | Previously Reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Increase (decrease) in restricted cash and cash equivalents, operating activities   323
Increase (decrease) in restricted cash and cash equivalents, investing activities   (4,773)
Increase (decrease) in restricted cash and cash equivalents, financing activities   (32,025)
Net increase in cash, cash equivalents and restricted cash   62,372
Cash, cash equivalents and restricted cash at beginning of period   224,190
Cash, cash equivalents and restricted cash at end of period   286,562
Accounting Standards Update 2016-18 | Restatement Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Increase (decrease) in restricted cash and cash equivalents, operating activities   (323)
Increase (decrease) in restricted cash and cash equivalents, investing activities   4,773
Increase (decrease) in restricted cash and cash equivalents, financing activities   32,025
Net increase in cash, cash equivalents and restricted cash   36,475
Cash, cash equivalents and restricted cash at beginning of period   416,028
Cash, cash equivalents and restricted cash at end of period   $ 452,503
[1] Following the adoption of the amendments to ASC 230, the statement of cash flows presents the change in the period in total cash, cash equivalents and restricted cash. These amendments have been applied retrospectively for the nine months ended September 30, 2017.