Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2019
Class of Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method	$ (15,981)		$ (15,981)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	9,053
2012 Repurchase Program [Member]
Class of Stock [Line Items]
Maximum number of shares authorized to be repurchased	5,000,000		5,000,000
Stock Repurchased		600,000	197,870
Treasury Stock, Value, Acquired, Cost Method		$ 42,500	$ 16,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	1,140,819		1,140,819