Stock-Based Incentive Plans - Stock Option Activity (Details) - Non-Qualified Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercisable at the start of the period (in shares)	523
Exercised (in shares)	(227)
Forfeited (in shares)	(1)
Exercisable at the end of the period (in shares)	295
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average exercise price at beginning of the period (in dollars per share) | $ / shares	$ 29.55
Weighted-average exercise price at end of the period (in dollars per share) | $ / shares	$ 29.62
Weighted-average remaining contractual life	1 year 3 months 18 days
Outstanding at the end of the period (in dollars) | $	$ 4,221
Closing price per share (in dollars per share) | $ / shares	$ 43.95