Stockholders' Equity Repurchases of Common Stock (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	May 01, 2019	Mar. 31, 2019	Apr. 01, 2018	Feb. 28, 2019	Nov. 30, 2018	Feb. 28, 2018	Feb. 28, 2017
Subsequent Event
Equity, Class of Treasury Stock
Treasury Stock, Shares, Acquired	308
Treasury Stock, Value, Acquired, Cost Method, excluding Commissions	$ 5,654
Stock Repurchase Program, Cost Incurred	$ 4
February 2019 Share Repurchase Program
Equity, Class of Treasury Stock
Stock Repurchase Program, Authorized Amount				$ 225,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 217,112
November 2018 and February 2019 Share Repurchase Programs
Equity, Class of Treasury Stock
Treasury Stock, Shares, Acquired		1,744
Treasury Stock, Value, Acquired, Cost Method, excluding Commissions		$ 29,345
Stock Repurchase Program, Repurchase Accrual		268
Stock Repurchase Program, Cost Incurred		$ 25
February 2018 Share Repurchase Program
Equity, Class of Treasury Stock
Stock Repurchase Program, Authorized Amount						$ 175,000
Treasury Stock, Shares, Acquired			989
Treasury Stock, Value, Acquired, Cost Method, excluding Commissions			$ 16,741
Stock Repurchase Program, Repurchase Accrual			1,294
Stock Repurchase Program, Cost Incurred			$ 14
November 2018 Share Repurchase Program
Equity, Class of Treasury Stock
Stock Repurchase Program, Authorized Amount					$ 220,000
February 2017 Share Repurchase Program
Equity, Class of Treasury Stock
Stock Repurchase Program, Authorized Amount							$ 150,000
Treasury Stock, Shares, Acquired			1,385
Treasury Stock, Value, Acquired, Cost Method, excluding Commissions			$ 22,633
Stock Repurchase Program, Cost Incurred			$ 19