Incentive Stock Plans - Schedule of Stock Option Activity (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Beginning Balance	1,219,734
Granted (in shares)	0	0
Exercised (in shares)	(81,895)
Cancelled or expired (in shares)	(58,039)
Number of Shares, Ending Balance	1,079,800	1,219,734
Number of Shares, Options exercisable	1,001,311
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price (in dollars per common share), Beginning Balance	$ 27.80
Granted (in dollars per share)	0.00
Exercised (in dollars per share)	19.56
Cancelled or expired (in dollars per share)	32.66
Weighted Average Exercise Price (in dollars per common share), Ending Balance	28.16	$ 27.80
Weighted Average Exercise Price (in dollars per common share), Options exercisable	$ 27.90
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual term (in years), Options outstanding	4 years 6 months 18 days
Weighted Average Remaining Contractual term (in years), Options exercisable	4 years 4 months
Aggregate Intrinsic Value, Options outstanding	$ 2,640
Aggregate Intrinsic Value, Options exercisable	$ 2,640