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1. Significant Accounting Policies Earnings per share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]      
Basic weighted average shares outstanding 29,186 28,876 28,586
Effect of potentially dilutive stock options and restricted stock awards 223 257 320
Diluted weighted average common shares 29,409 29,133 28,906
Anti-dilutive shares excluded from the computation of diluted EPS 109 122 107