Stock-Based Compensation, Stock Award and Incentive Plan and Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock available for issuance (in shares)	0	880,000
Term of stock options granted under Plan	10 years
Vesting period, generally, for stock options granted under the plan	3 years
Share based compensation costs	$ 3,500	$ 4,000	$ 3,100
Tax benefit of share-based compensation	$ 1,400	$ 1,600	$ 1,200
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate assumed	7.38%	7.34%	7.13%
Weighted average grant date fair value for stock options granted (in dollars per share)	$ 14.34	$ 22.68	$ 22.89
Weighted average grant date fair value for stock options vested (in dollars per share)	$ 20.94	$ 17.83	$ 13.59
Total intrinsic value of stock options exercised	$ 4,900	$ 2,400	$ 13,000
Weighted Average Assumptions [Abstract]
Expected life	6 years 6 months	6 years 4 months 24 days	6 years 6 months
Interest rate	1.72%	1.52%	2.16%
Volatility	36.75%	36.86%	37.15%
Expected dividend yield	0.54%	0.33%	0.34%
Stock Options [Roll Forward]
Balance, beginning of year (in shares)	1,091,844
Granted (in shares)	383,622
Exercised (in shares)	(150,944)
Canceled (in shares)	(125,797)
Balance, end of year (in shares)	1,198,725	1,091,844
Exercisable, end of year (in shares)	767,313
Weighted Average Exercise Price Per Share [Abstract]
Balance, beginning of year (in dollars per share)	$ 42.29
Granted (in dollars per share)	38.59
Exercised (in dollars per share)	36.66
Canceled (in dollars per share)	43.78
Balance, end of year (in dollars per share)	41.66	$ 42.29
Exercisable, end of year (in dollars per share)	$ 39.43
Weighted Average Remaining Contractual Life [Abstract]
Outstanding options, end of year	6 years 6 months 4 days
Exercisable options, end of year	5 years 3 months 22 days
Aggregate Intrinsic Value [Abstract]
Outstanding options, end of year	$ 42,700
Exercisable options, end of year	$ 29,000
Additional Information [Abstract]
Closing stock price on last business day of the period (in dollars per share)	$ 77.25
Weighted average intrinsic value of options exercised (in dollars per share)	$ 32.34	$ 32.07	$ 40.17
Unrecognized stock-based compensation expense	$ 3,800
Weighted average period over which unrecognized stock-based compensation expense is expected to be recognized	3 years
Nonvested Stock Options [Member]
Stock Options [Roll Forward]
Balance, beginning of year (in shares)	353,859
Granted (in shares)	383,622
Vested (in shares)	(191,775)
Canceled (in shares)	(114,294)
Balance, end of year (in shares)	431,412	353,859
Weighted Average Exercise Price Per Share [Abstract]
Balance, beginning of year (in dollars per share)	$ 57.21
Granted (in dollars per share)	38.59
Vested (in dollars per share)	55.01
Canceled (in dollars per share)	42.18
Balance, end of year (in dollars per share)	$ 45.61	$ 57.21
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation costs	$ 5,800	$ 8,800	$ 4,900
Additional Information [Abstract]
Unrecognized stock-based compensation expense	$ 6,100
Weighted average period over which unrecognized stock-based compensation expense is expected to be recognized	3 years