Share-Based Compensation - Schedule of Share Based Compensation Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Stock Options, Shares:
Outstanding Beginning Shares	2,736
Exercised Shares	(639)
Forfeited or Expired Shares	(20)
Outstanding Ending Shares	2,077	2,736
Shares Exercisable	1,790
Weighted Average Exercise Price:
Outstanding Beginning Weighted Average Exercise Price	$ 21.26
Exercised Weighted Average Exercise Price	15.50
Outstanding Ending Weighted Average Exercise Price	23.02	$ 21.26
Exercisable Weighted Average Exercise Price	$ 22.81
Weighted Average Remaining Contractual Term:
Outstanding Weighted Average Remaining Contractual Term	4 years 2 months 12 days	4 years
Exercisable Weighted Average Remaining Contractual Term	3 years 9 months 18 days
Aggregate Intrinsic Value :
Outstanding Intrinsic Value	$ 17,840
Exercised Intrinsic Value	7,785
Outstanding Intrinsic Value	2,739	$ 17,840
Exercisable Intrinsic Value	$ 2,586