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Earnings Per Share (Summary Of Basic And Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Net income (loss) attributable to common shareholders (2) $ (118,685) $ 6,520 $ 30,426 $ 12,523 $ (28,272) $ (2,263) $ 18,086 $ 7,155 $ (69,216) $ (5,294) $ (31,738)
Weighted average common shares outstanding - basic (shares)                 68,421 72,255 73,371
Weighted average common shares outstanding - diluted (shares)                 68,421 72,255 73,371
Basic (in dollars per share) $ (1.72) $ 0.08 $ 0.37 $ 0.15 $ (0.41) $ (0.03) $ 0.21 $ 0.08 $ (1.01) $ (0.07) $ (0.43)
Diluted (in dollars per share) $ (1.72) $ 0.07 $ 0.35 $ 0.15 $ (0.41) $ (0.03) $ 0.20 $ 0.08 $ (1.01) $ (0.07) $ (0.43)