Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic EPS- Income:
Net income (loss) available to common stockholders, continuing operations									$ 45,494	$ 53,729	$ (6,904)
Net income (loss) available to common stockholders, discontinued operations									$ (6,604)	$ 814	$ (37,089)
Basic EPS - Shares:
Shares outstanding, basic (in shares)									41,095	38,753	37,555
Basic EPS - Per Share Amount:
Net income (loss) from continuing operations	$ 0.34	$ 0.20	$ 0.22	$ 0.35	$ 0.35	$ 0.40	$ 0.38	$ 0.26	$ 1.11	$ 1.39	$ (0.18)
Net Income available to common stockholders, discontinued operations (in dollars per share)									$ (0.16)	$ 0.02	$ (0.99)
Effect of dilutive securities - Shares:
Stock compensation plans (in shares)									428	688
Diluted EPS - Income
Diluted EPS, continuing operations									$ 45,494	$ 53,729	$ (6,904)
Diluted EPS, discontinued operations									$ (6,604)	$ 814	$ (37,089)
Diluted EPS - Shares
Shares outstanding, diluted (in shares)									41,523	39,441	37,555
Diluted EPS - Per Share Amount
Diluted earnings per share - continuing operations (in dollars per share)	$ 0.33	$ 0.19	$ 0.22	$ 0.35	$ 0.34	$ 0.40	$ 0.37	$ 0.25	$ 1.10	$ 1.36	$ (0.18)
Diluted EPS, discontinued operations (in dollars per share)									$ (0.16)	$ 0.02	$ (0.99)