Share-Based Compensation - Schedule of Share Based Compensation Stock Options Activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Stock Options, Shares:
Outstanding Beginning Shares	3,126
Granted Shares	176
Exercised Shares	(304)
Forfeited or Expired Shares	(2)
Outstanding Ending Shares	2,996	3,126
Shares Exercisable	2,406
Weighted Average Exercise Price:
Outstanding Beginning Weighted Average Exercise Price	$ 18.93
Granted Weighted Average Exercise Price	$ 27.92
Exercised Weighted Average Exercise Price	$ 9.66
Forfeited or Expired Weighted Average Exercise Price	$ 29.21
Outstanding Ending Weighted Average Exercise Price	$ 20.39	$ 18.93
Exercisable Weighted Average Exercise Price	$ 19.43
Weighted Average Remaining Contractual Term:
Outstanding Beginning Weighted Average Remaining Contractual Term	4 years	4 years
Outstanding Ending Weighted Average Remaining Contractual Term	4 years	4 years
Exercisable Weighted Average Remaining Contractual Term	3 years
Aggregate Intrinsic Value :
Outstanding Beginning Intrinsic Value	$ 17,461
Exercised Intrinsic Value	5,422
Outstanding Ending Intrinsic Value	25,754	17,461
Exercisable Intrinsic Value	$ 22,967