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Equity Incentive Programs (Deferred Stock Unit Activity) (Details) - Deferred Stock Units (DSUs) [Member] - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Units        
Outstanding at beginning of period (in shares)     156,807  
Granted (in shares) 0 34,139 78,750 34,139
Dividend equivalent units (in shares) 3,244 2,303 8,174 3,730
Settled (in shares)     0  
Forfeited (in shares)     0  
Outstanding at end of period (in shares) 243,731   243,731  
Weighted-Average Grant Date Fair Value Per Share        
Outstanding at beginning of period (in dollars per share)     $ 20.51  
Granted (in dollars per share)   $ 23.11 9.30 $ 23.11
Dividend equivalents granted (in dollars per share)     16.58  
Settled (in dollars per share)     0.00  
Forfeited (in dollars per share)     0.00  
Outstanding at end of period (in dollars per share) $ 16.76   $ 16.76  
Number of DSU to class A common share conversion (in shares) 1   1  
Compensation expense $ 0 $ 800,000 $ 800,000 $ 800,000