Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jan. 31, 2016
Stockholders' Equity [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	636,000	620,000	637,000	888,000
Translation adjustment	$ (28,029)	$ 20,400	$ 6,673	$ (34,940)
2016 Share Repurchase Plan [Member]
Stockholders' Equity [Line Items]
Stock Repurchase Program, Authorized Amount					$ 100,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased					5,000,000
Treasury Stock, Shares, Acquired			1,100,000
Treasury Stock Acquired, Average Cost Per Share			$ 65.74
Treasury Stock, Value, Acquired, Cost Method			$ 75,600
Repurchase Plan Program [Member]
Stockholders' Equity [Line Items]
Stock Repurchase Program, Authorized Amount	$ 125,000		$ 125,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	3,000,000		3,000,000