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Summary of Significant Accounting Policies (Revised Condensed Consolidated Statement of Stockholders' Equity) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Retained earnings, beginning of period   $ 137,478 $ 151,440 $ 151,342 $ 137,478 $ 151,342
Beginning balance $ 252,129 247,693 260,188 259,232 247,693 259,232
Net income (loss) 165 4,082 327 98 4,247 425
Retained earnings, end of period 141,725   151,767 151,440 141,725 151,767
Ending balance $ 252,857 $ 252,129 261,116 260,188 $ 252,857 261,116
As Reported            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Retained earnings, beginning of period     152,648 152,291   152,291
Beginning balance     261,396 260,181   260,181
Net income (loss)     573 357   930
Retained earnings, end of period     153,221 152,648   153,221
Ending balance     262,570 261,396   262,570
Revisions | Revision of Prior Period Financial Statements            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Retained earnings, beginning of period     (1,208) (949)   (949)
Beginning balance     (1,208) (949)   (949)
Net income (loss)     (246) (259)   (505)
Retained earnings, end of period     (1,454) (1,208)   (1,454)
Ending balance     $ (1,454) $ (1,208)   $ (1,454)