Share Repurchase Program and Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Share Repurchase Program and Treasury Stock (Textuals) [Abstract]
Remaining Amount to Repurchase under the program	$ 107,200
Stock Repurchase Program, Additional Authorized Amount	$ 1,500,000
Shares Purchased Under Share Repurchase Program	24,200,000
Treasury Stock, Value, Acquired, Cost Method	$ 371,223	$ 296,500	$ 414,000
Number of shares repurchased	(1,167,796)	(1,186,215)
Average price of share repurchased, per share	$ 317.86	$ 249.91
Exercise of stock options and restricted stock units, shares reissued	281,627	246,551