Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Mar. 31, 2016 $ / shares shares	Jan. 31, 2016 $ / shares shares	Mar. 31, 2015 $ / shares shares	Jun. 30, 2016 USD ($) plan shares	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) installment plan shares	Jun. 30, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans offered | plan				1		1
Stock-based compensation cost | $				$ 45,823	$ 30,792	$ 87,920	$ 65,003
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares)	234,816
Performance period for grants	3 years
Performance share maximum annualized shareholder return (percent)	10.00%
Performance share earned share cap based on maximum shareholder return (percent)	100.00%
Performance share minimum annualized shareholder return (percent)	5.00%
Performance share earned share cap based on minimum shareholder return (percent)	200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Target Shareholder Return, Percent, Maximum to attain 200%	30.00%
Performance share period to determine actual stock grant following end of interim measurement period	60 days
Performance share interim measurement period	18 months
Performance share earned share cap based on interim measurement period (percent)	33.00%
Period to determine actual stock grant following end of performance period	60 days
Market and Service Condition Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares)			393,464
Performance period for grants			3 years
Period to determine actual stock grant following end of performance period			60 days
Maximum percentage of market and service condition stock units that will ultimately vest			200.00%
Percentage that Company's return exceeds indexed return			40.00%
Percentage that Company's return underperforms index			20.00%
Percent of award issued if return is negative but index is met			75.00%
Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares represented by each non-vested stock unit upon vesting			1
Expected life (in years)	3 years	3 years	2 years 9 months 3 days
The estimated fair value of each award (in dollars per share) | $ / shares	$ 66.18	$ 49.68	$ 61.01
Share based awards granted and outstanding				5,151,781		5,151,781
Total unrecognized compensation cost related to stock-based compensation | $				$ 277,100		$ 277,100
Total unrecognized compensation cost recognition period						2 years 20 days
Superseded and Expired Stock Plans [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed						5 years
Superseded and Expired Stock Plans [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed						10 years
2014 Plan [Member] | Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period for grants							1 year
Period to determine actual stock grant following end of performance period							60 days
Maximum percentage of market and service condition stock units that will ultimately vest							100.00%
2014 Plan [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
Number of shares per non-vested stock unit						1
Stock-based compensation award vesting period, number of monthly installments | installment						12
2014 Plan [Member] | Annual vesting on each anniversary [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage						33.33%
2015 ESPP Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan				16,000,000		16,000,000
Employee Stock Purchase Plan, payment period						6 months
Employee Stock Purchase Plan, maximum number of shares per period that employees can purchase						12,000
Employee Stock Purchase Plan, purchase price as a percentage of fair market value				85.00%
Employee Stock Purchase Plan, employee disqualification, ownership percent of outstanding stock						5.00%
Employee Stock Purchase Plan, total shares issued under plan				527,367		527,367
Expected life (in years)						6 months
2015 ESPP Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, option to purchase shares through payroll deduction, payroll deduction amount per pay period per employee, as a percentage of base pay						1.00%
2015 ESPP Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, option to purchase shares through payroll deduction, payroll deduction amount per pay period per employee, as a percentage of base pay						10.00%
2005 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, total shares issued under plan				3,872,661		3,872,661
ESPPs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost | $				$ 2,500	$ 1,300	$ 5,200	$ 2,900
Common Stock [Member] | 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan				29,000,000		29,000,000
Shares reserved for issuance under the stock-based compensation plans				21,980,489		21,980,489
Shares available for grant under the 2014 Plan				16,526,939		16,526,939
Executive Officers [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost | $				$ 2,800		$ 5,400
Non-vested stock unit awards granted to senior level employees (shares)						118,588
Total unrecognized compensation cost recognition period						1 year 10 months 10 days
Total unrecognized compensation cost | $				$ 9,500		$ 9,500
Executive Officers [Member] | Minimum [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						1 year
Executive Officers [Member] | Maximum [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
Chief Executive Officer [Member] | Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares)		220,235