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Basis of Presentation and Significant Accounting Policies, Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Recently Adopted Accounting Pronouncements        
Proceeds from insurance settlements from net cash provided by operating activities   $ 493 $ 493  
Cash and cash equivalents at beginning of period   104,374    
Cash, cash equivalents and restricted cash at beginning of period   243,772 167,960  
Net increase in cash, cash equivalents and restricted cash   51,562 53,930  
Cash and cash equivalents at end of period   92,598    
Cash, cash equivalents and restricted cash at end of period $ 221,890 295,334 221,890  
Net cash (used in) provided by operating activities: change in operating assets and liabilities   (96,468) (6,368)  
Net cash used in investing activities   (550,216) (350,348)  
Net cash used in financing activities   797,314 16,840  
Unrealized gains on available-for-sale securities into accumulated deficit (235)   (353)  
Accumulated deficit   $ (78,316)   $ (101,926)
Accounting Standards Update 2016-02        
Recently Adopted Accounting Pronouncements        
Maximum percentage of total assets and total liabilities   1.00%    
ASU 2016-15        
Recently Adopted Accounting Pronouncements        
Proceeds from insurance settlements from net cash provided by operating activities     500  
Net cash used in investing activities     (500)  
Previously reported under GAAP        
Recently Adopted Accounting Pronouncements        
Cash and cash equivalents at beginning of period     138,645  
Net decrease in cash and cash equivalents     (53,894)  
Cash and cash equivalents at end of period 84,751   84,751  
Net cash (used in) provided by operating activities: change in operating assets and liabilities     (6,252)  
Net cash used in investing activities     (350,841)  
Net cash used in financing activities     (90,954)  
ASU 2016-18 and ASU 2016-15        
Recently Adopted Accounting Pronouncements        
Cash, cash equivalents and restricted cash at beginning of period     167,960  
Net increase in cash, cash equivalents and restricted cash     53,930  
Cash, cash equivalents and restricted cash at end of period $ 221,890   221,890  
Net cash (used in) provided by operating activities: change in operating assets and liabilities     (6,368)  
Net cash used in investing activities     (350,348)  
Net cash used in financing activities     $ 16,840  
ASU 2016-01        
Recently Adopted Accounting Pronouncements        
Unrealized gains on available-for-sale securities into accumulated deficit   $ (200)    
Accumulated deficit   $ 200