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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, 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	$ 15,653	$ 5,825	$ 8,719	$ 10,657	$ 46,696	$ 7,197	$ 6,139	$ (4,545)	$ 40,854	$ 55,487	$ 14,664
Basic-weighted average shares outstanding									28,118	27,939	27,804
Effect of dilutive potential securities									772	232	160
Diluted-weighted average shares outstanding									28,890	28,171	27,964
Basic EPS (in dollars per share)	$ 0.56	$ 0.21	$ 0.31	$ 0.38	$ 1.67	$ 0.26	$ 0.22	$ (0.16)	$ 1.45	$ 1.99	$ 0.53
Diluted EPS (in dollars per share)	$ 0.54	$ 0.20	$ 0.30	$ 0.37	$ 1.65	$ 0.26	$ 0.22	$ (0.16)	$ 1.41	$ 1.97	$ 0.52
Shares excluded from computation of earnings per share									700	1,200	1,400

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