Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation and Other Compensation Matters (Details 4)

v3.3.1.900
Share-Based Compensation and Other Compensation Matters (Details 4) - Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding and Exercisable (in shares) 425,347 559,736 640,927 798,210
Weighted Average Exercise Price Per Share (in dollars per share) $ 42.75 $ 39.60 $ 38.11 $ 37.62
Weighted Average Remaining Contractual Term (years) 1 year 2 years 2 years 3 years
Aggregate Intrinsic Value   $ 167 $ 68 $ 325