Organization and Summary of Significant Accounting Policies (Earning Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Income (loss) from continuing operations, net of tax	$ 7,013	$ 20,388	$ 10,902	$ 14,580	$ 11,528	$ 13,572	$ 5,583	$ 6,976	$ 52,883	$ 37,659	$ 69,134
Weighted-average shares outstanding - basic									18,177,178	17,197,840	16,426,209
Effect of dilutive stock options (in shares)									520,600	570,235	564,949
Denominator for diluted earnings per share - Adjusted weighted-average shares and assumed conversions (shares)									18,697,778	17,768,075	16,991,158
Net income per basic share (in dollars per share)	$ 0.38	$ 1.12	$ 0.60	$ 0.81	$ 0.66	$ 0.79	$ 0.33	$ 0.41	$ 2.91	$ 2.19	$ 4.21
Net income per diluted share (in dollars per share)	$ 0.37	$ 1.09	$ 0.58	$ 0.79	$ 0.64	$ 0.76	$ 0.32	$ 0.39	$ 2.83	$ 2.12	$ 4.07
Antidilutive securities excluded from computation of earnings per share (shares)									0	0	68,000