Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 1,972	$ 5,687	$ 20,853	$ 25,712
Basic-weighted average shares outstanding	27,454,000	27,518,000	27,354,000	27,744,000
Effect of dilutive potential securities	234,000	316,000	423,000	367,000
Diluted- weighted average shares outstanding	27,688,000	27,834,000	27,777,000	28,111,000
Basic (per share)	$ 0.07	$ 0.21	$ 0.76	$ 0.93
Diluted (per share)	$ 0.07	$ 0.20	$ 0.75	$ 0.91
Shares excluded from computation of earnings per share	100,000	0	0	0