Share Repurchase Program Share Repurchse Program (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Apr. 24, 2019
Stock Repurchase Program, Authorized Amount	$ 166,754,000			$ 166,754,000
Shares Paid for Tax Withholding for Share Based Compensation				90,016
Stock Repurchased During Period, Shares	1,059,000		289,000	1,584,000	1,140,000
Stock Repurchased During Period, Value				$ 48,206
Stock Repurchase Program, Remaining Authorized Repurchase Amount						$ 200,000
Treasury Stock Acquired, Average Cost Per Share				$ 32.77
Payments Related to Tax Withholding for Share-based Compensation				$ 2,950
Common Stock [Member]
Stock Repurchased During Period, Shares				1,494,171
Treasury Stock Acquired, Average Cost Per Share				$ 32.26
Trade Names [Member]
Amortization		$ 1,132