Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 12,603	$ 8,684
Weighted average common shares outstanding - Basic (in shares)	41,526	40,043
Dilutive effect of stock-based awards (in shares)	438	431
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	0	0
Weighted average common shares outstanding - Diluted (in shares)	41,964	40,474
Earnings (loss) per common share - Basic (in dollars per share)	$ 0.30	$ 0.22
Earnings (loss) per common share - Diluted (in dollars per share)	$ 0.30	$ 0.21