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Basis of Presentation and Significant Accounting Policies, Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Recently Adopted Accounting Pronouncements      
Cash and cash equivalents at beginning of period $ 160,063 $ 104,374 $ 138,645
Cash, cash equivalents and restricted cash at beginning of period 340,669 243,772 167,960
Net increase (decrease) in cash, cash equivalents and restricted cash 169,893 96,897 75,812
Cash and cash equivalents at end of period 299,687 160,063 104,374
Cash, cash equivalents and restricted cash at end of period 510,562 340,669 243,772
Net cash provided by (used in) operating activities: changes in operating assets and liabilities (8,332) (8,205) (308)
Net cash used in investing activities (994,740) (681,875) (906,845)
Net cash provided by financing activities 1,391,170 816,507 522,953
Unrealized loss on securities available-for-sale, at fair value     (382)
Retained Earnings (Accumulated Deficit) $ (60,920) (74,133)  
Previously reported under GAAP      
Recently Adopted Accounting Pronouncements      
Cash and cash equivalents at beginning of period   104,374 138,645
Net decrease in cash and cash equivalents     (34,271)
Cash and cash equivalents at end of period     104,374
Net cash provided by (used in) operating activities: changes in operating assets and liabilities     822
Net cash used in investing activities     (907,949)
Net cash provided by financing activities     412,844
ASU 2016-15 and ASU 2016-18      
Recently Adopted Accounting Pronouncements      
Cash, cash equivalents and restricted cash at beginning of period   $ 243,772 167,960
Net increase (decrease) in cash, cash equivalents and restricted cash     75,812
Cash, cash equivalents and restricted cash at end of period     243,772
Net cash provided by (used in) operating activities: changes in operating assets and liabilities     (308)
Net cash used in investing activities     (906,845)
Net cash provided by financing activities     $ 522,953