Compensation Plans - Schedule of Employee Stock Options and SSARs Activity (Details) - Stock Options and SSARs	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Shares
Outstanding at beginning of period (in shares) | shares	401,581
Granted (in shares) | shares	0
Exercised (in shares) | shares	(13,478)
Forfeited (in shares) | shares	0
Outstanding at end of period (in shares) | shares	388,103
Exercisable (in shares) | shares	388,103
Weighted Average Exercise Price
Outstanding at beginning of period (usd per share) | $ / shares	$ 19.24
Granted (usd per share) | $ / shares	0.00
Exercised (usd per share) | $ / shares	21.54
Forfeited (usd per share) | $ / shares	0.00
Outstanding at end of period (usd per share) | $ / shares	19.15
Exercisable (usd per share) | $ / shares	$ 19.15
Additional Disclosures
Outstanding, weighted average remaining contractual term	2 years 9 months
Exercisable, weighted average remaining contractual term	2 years 9 months
Outstanding, aggregate intrinsic value | $	$ 3,569
Exercisable, aggregate intrinsic value | $	$ 3,569