Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v3.6.0.2
Summary of Significant Accounting Policies (Details) - shares
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, 2016
Dec. 31, 2015
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]                      
Weighted average shares outstanding (shares): 20,898 20,887 20,832 20,708 19,933 19,887 19,725 19,612 20,831 19,790 20,419
Dilutive potential common shares:                      
Restricted stock (shares)                 0 56 36
Stock options (shares)                 0 882 978
2019 Convertible Senior Notes (shares)                 0 499 0
Shares used to compute diluted income per share (shares) 20,898 22,997 20,832 22,284 21,542 21,460 21,276 20,631 20,831 21,228 21,433
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares)                 3,544 3,333 5,104