Annual report pursuant to Section 13 and 15(d)

Common Stock (Narrative) (Details)

v3.7.0.1
Common Stock (Narrative) (Details) - $ / shares
Dec. 31, 2016
Dec. 23, 2009
Common Stock [Abstract]    
Remaining number of shares authorized to be repurchased 411,910  
Number of rights distributed for each share of common stock   1
Number of securities into which each right may be converted   0.01
Exercise price of right   $ 41
Percentage of common stock required to be purchased for rights to become exercisable   16.50%