Stock Awards Stock Awards - Restricted Stock Unit Table (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Compensation expense recognized, vesting term (in years)	4 years
Shares Outstanding
Non-vested shares units beginning balance	12,417,805	9,941,074
Restricted stock units (RSUs) granted in period	6,870,285	6,941,008
Number of shares, vested	(5,213,662)	(3,290,220)
Number of shares, forfeited	(1,852,146)	(1,174,057)
Non-vested shares units ending balance	12,222,282	12,417,805	9,941,074
Expected to vest	10,221,726
Weighted-Average Grant Date Fair Value
Weighted-average grant date fair value, outstanding, beginning balance, (in USD per share)	$ 63.38	$ 51.19
Weighted-average grant date fair value, granted (in USD per share)	61.22	73.98
Weighted-average grant date fair value, vested, ( in USD per share)	59.95	50.25
Weighted-average grant date fair value, repurchased (in USD per share)	63.18	59.67
Weighted-average grant date fair value, outstanding, ending balance, (in USD per share)	$ 63.66	$ 63.38	$ 51.19
Aggregate intrinsic value, vested	$ 354,320	$ 254,691	$ 73,700
Aggregate intrinsic value, non-vested	908,604
Aggregated intrinsic value, expected to vest	$ 759,883