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Earnings Per Share (Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income (numerator) [Abstract]        
Basic earnings (loss) per share, Net income (loss) available to common shareholders $ 7,281 $ (25,551) $ 34,108 $ (67,720)
Diluted earnings (loss) per share, Net income (loss) available to common shareholders $ 7,281 $ (25,551) $ 34,108 $ (67,720)
Shares (denominator) [Abstract]        
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in shares) 55,758,433 47,153,658 55,661,538 40,957,247
Effect of dilutive securities, Common stock options (in shares) 554,405   382,371  
Diluted earnings (loss) per share, Net income (loss) available to common shareholders (in shares) 56,312,838 47,153,658 56,043,909 40,957,247
Per share amount [Abstract]        
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in dollars per share) $ 0.13 $ (0.54) $ 0.61 $ (1.65)
Net income (loss) per share - diluted (in dollars per share) $ 0.13 $ (0.54) $ 0.61 $ (1.65)
Continuing Operations [Member]        
Income (numerator) [Abstract]        
Basic earnings (loss) per share, Net income (loss) available to common shareholders $ 6,770 $ (1,530) $ 30,670 $ (29,811)
Diluted earnings (loss) per share, Net income (loss) available to common shareholders $ 6,770 $ (1,530) $ 30,670 $ (29,811)
Shares (denominator) [Abstract]        
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in shares) 55,758,433 47,153,658 55,661,538 40,957,247
Effect of dilutive securities, Common stock options (in shares) 554,405   382,371  
Diluted earnings (loss) per share, Net income (loss) available to common shareholders (in shares) 56,312,838 47,153,658 56,043,909 40,957,247
Per share amount [Abstract]        
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in dollars per share) $ 0.12 $ (0.03) $ 0.55 $ (0.73)
Net income (loss) per share - diluted (in dollars per share) $ 0.12 $ (0.03) $ 0.55 $ (0.73)
Discontinued Operations [Member]        
Income (numerator) [Abstract]        
Basic earnings (loss) per share, Net income (loss) available to common shareholders $ 511 $ (24,021) $ 3,438 $ (37,909)
Diluted earnings (loss) per share, Net income (loss) available to common shareholders $ 511 $ (24,021) $ 3,438 $ (37,909)
Shares (denominator) [Abstract]        
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in shares) 55,758,433 47,153,658 55,661,538 40,957,247
Effect of dilutive securities, Common stock options (in shares) 554,405   382,371  
Diluted earnings (loss) per share, Net income (loss) available to common shareholders (in shares) 56,312,838 47,153,658 56,043,909 40,957,247
Per share amount [Abstract]        
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in dollars per share) $ 0.01 $ (0.51) $ 0.06 $ (0.92)
Net income (loss) per share - diluted (in dollars per share) $ 0.01 $ (0.51) $ 0.06 $ (0.92)