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Summary of Significant Accounting Policies (Revised Condensed Consolidated Statement of Stockholders' Equity) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Retained earnings, beginning of period     $ 137,478 $ 151,767 $ 151,440 $ 151,342 $ 137,478 $ 151,342
Beginning balance $ 252,857 $ 252,129 247,693 261,116 260,188 259,232 247,693 259,232
Net loss (562) 165 4,082 (12,579) 327 98 3,685 (12,154)
Retained earnings, end of period 141,163     139,188 151,767 151,440 141,163 139,188
Ending balance $ 252,858 $ 252,857 $ 252,129 248,690 261,116 260,188 $ 252,858 248,690
As Reported                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Retained earnings, beginning of period       153,221 152,648 152,291   152,291
Beginning balance       262,570 261,396 260,181   260,181
Net loss       (12,232) 573 357   (11,302)
Retained earnings, end of period       140,989 153,221 152,648   140,989
Ending balance       250,491 262,570 261,396   250,491
Revisions | Revision of Prior Period Financial Statements                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Retained earnings, beginning of period       (1,454) (1,208) (949)   (949)
Beginning balance       (1,454) (1,208) (949)   (949)
Net loss       (347) (246) (259)   (852)
Retained earnings, end of period       (1,801) (1,454) (1,208)   (1,801)
Ending balance       $ (1,801) $ (1,454) $ (1,208)   $ (1,801)