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Recently Issued Accounting Standards Recently Issued Accounting Standards (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 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] $ 214,708 141,379
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] $ 827,385 781,597
Accounting Standards Update 2016-18 [Member] | Previously Reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Increase (decrease) in restricted cash and cash equivalents, operating activities   (406)
Increase (decrease) in restricted cash and cash equivalents, investing activities   (6,544)
Increase (decrease) in restricted cash and cash equivalents, financing activities   (15,393)
Net increase in cash, cash equivalents and restricted cash   119,036
Cash, cash equivalents and restricted cash at beginning of period   224,190
Cash, cash equivalents and restricted cash at end of period   343,226
Accounting Standards Update 2016-18 [Member] | Restatement Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Increase (decrease) in restricted cash and cash equivalents, operating activities   406
Increase (decrease) in restricted cash and cash equivalents, investing activities   6,544
Increase (decrease) in restricted cash and cash equivalents, financing activities   15,393
Net increase in cash, cash equivalents and restricted cash   22,343
Cash, cash equivalents and restricted cash at beginning of period   416,028
Cash, cash equivalents and restricted cash at end of period   $ 438,371
[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 six months ended June 30, 2017.