Incentive Stock Plans - Schedule of Stock Option Activity (Details) - Stock Options $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Beginning Balance | shares	1,369,900
Granted (in shares) | shares	0
Exercised (in shares) | shares	(113,082)
Cancelled or expired (in shares) | shares	(37,084)
Number of Shares, Ending Balance | shares	1,219,734
Number of Shares, Options exercisable | shares	1,003,510
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 | $ / shares	$ 27.21
Granted (in dollars per share) | $ / shares	0.00
Exercised (in dollars per share) | $ / shares	18.95
Cancelled or expired (in dollars per share) | $ / shares	32.86
Weighted Average Exercise Price (in dollars per common share), Ending Balance | $ / shares	27.80
Weighted Average Exercise Price (in dollars per common share), Options exercisable | $ / shares	$ 26.63
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual term (in years), Options outstanding	5 years 3 months 18 days
Weighted Average Remaining Contractual term (in years), Options exercisable	4 years 8 months 12 days
Aggregate Intrinsic Value, Options outstanding | $	$ 1,380
Aggregate Intrinsic Value, Options exercisable | $	$ 1,380