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Compensation Plans - Schedule of Employee Stock Options and SSARs Activity (Details) - Stock Options and SSARs
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Shares  
Outstanding at beginning of period (in shares) | shares 388,103
Granted (in shares) | shares 0
Exercised (in shares) | shares (117,857)
Forfeited (in shares) | shares 0
Outstanding at end of period (in shares) | shares 270,246
Exercisable (in shares) | shares 270,246
Weighted Average Exercise Price  
Outstanding at beginning of period (usd per share) | $ / shares $ 19.15
Granted (usd per share) | $ / shares 0.00
Exercised (usd per share) | $ / shares 19.85
Forfeited (usd per share) | $ / shares 0.00
Outstanding at end of period (usd per share) | $ / shares 18.85
Exercisable (usd per share) | $ / shares $ 18.85
Additional Disclosures  
Outstanding, weighted average remaining contractual term 1 year 11 months
Exercisable, weighted average remaining contractual term 1 year 11 months
Outstanding, aggregate intrinsic value | $ $ 6,527
Exercisable, aggregate intrinsic value | $ $ 6,527