Organization and Summary of Significant Accounting Policies (Intangibles and Per Share Information) (Details) - USD ($) shares in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares:
Weighted-average number of common shares outstanding	6,149	6,307	6,685	7,149	7,739	7,839	7,841	7,848	7,839	7,938	7,976	7,914	6,570	7,817	7,917
Dilutive and potentially dilutive common shares													144	170	224
Total shares	6,275	6,448	6,819	7,272	7,872	7,963	7,841	8,044	8,037	8,123	8,179	8,129	6,714	7,987	8,141
Indefinite lived intangible assets
Intangible Assets
Intangible assets with indefinite useful lives	$ 0												$ 0
Customer relationships
Intangible Assets
Useful life													5 years