Employee Benefit Plans (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Shares
Outstanding at December 31, 2013			2,989
Granted	723	78	933	530
Exercised			(376)
Forfeited			(41)
Outstanding as of June 30, 2014	3,505		3,505		2,989
Vested and expected to vest at June 30, 2014	3,389		3,389
Exercisable at June 30, 2014	2,006		2,006
Weighted average exercise price
Outstanding at December 31, 2013			$ 11.80
Granted			$ 42.11
Exercised			$ 10.09
Forfeited			$ 29.68
Outstanding as of June 30, 2014	$ 19.84		$ 19.84		$ 11.80
Vested and expected to vest at June 30, 2014	$ 19.34		$ 19.34
Exercisable at june 30, 2014	$ 9.48		$ 9.48
Remaining contractual term (years)
Outstanding			7 years 2 months 1 day		6 years 6 months 18 days
Vested and expected to vest at June 30, 2014			7 years 1 month 2 days
Exercisable at June 30, 2014			5 years 7 months 13 days
Aggregate intrinsic value
Outstanding at December 31, 2013			$ 142,377
Outstanding as of June 30, 2014	101,376		101,376		142,377
Vested and expected to vest at June 30, 2014	99,639		99,639
Exercisable at June 30, 2014	$ 77,679		$ 77,679