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Operations and Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings per share:
Net income	$ 24,140	$ 6,850	$ (27,400)	$ 5,927	$ 14,933	$ 6,970	$ 5,695	$ 1,021	$ 9,517	$ 28,620	$ 40,854
Basic-weighted average shares outstanding (in shares)									28,581	28,325	28,118
Effect of dilutive potential securities (in shares)									883	1,170	772
Diluted-weighted average shares outstanding (in shares)									29,464	29,495	28,890
Basic EPS (in dollars per share)	$ 0.84	$ 0.24	$ (0.96)	$ 0.21	$ 0.53	$ 0.25	$ 0.20	$ 0.04	$ 0.33	$ 1.01	$ 1.45
Diluted EPS (in dollars per share)	$ 0.81	$ 0.23	$ (0.96)	$ 0.20	$ 0.49	$ 0.23	$ 0.19	$ 0.04	$ 0.32	$ 0.97	$ 1.41
Shares excluded from computation of earnings per share									1,400	700	700

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