Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Summary Of The Changes In The Number Of Outstanding Phantom Stock Shares) (Details) [Axis]

v3.3.1.900
Share-Based Compensation (Summary Of The Changes In The Number Of Outstanding Phantom Stock Shares) (Details) [Axis]
12 Months Ended
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Balance of shares outstanding at December 31, 2014 627,133
Granted 61,440
Settled (86,969)
Forfeited 0
Balance of shares outstanding at December 31, 2015 601,604
Employee Phantom Stock Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Balance of shares outstanding at December 31, 2014 551,396
Granted 54,924
Settled (86,969)
Forfeited 0
Balance of shares outstanding at December 31, 2015 519,351
Director Phantom Stock Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Balance of shares outstanding at December 31, 2014 75,737
Granted 6,516
Settled 0
Forfeited 0
Balance of shares outstanding at December 31, 2015 82,253