Stock Based Compensation (Details) - Stock Option Activity - 2014 and 2003 Stock Option Plan [Member] $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Number of Options (in thousands)
Options outstanding, beginning balance (in Shares) | shares	4,757
Granted (in Shares) | shares	951
Exercised (in Shares) | shares	(1,522)
Forfeited (in Shares) | shares	(160)
Options outstanding, ending balance (in Shares) | shares	4,026	4,757
Options, exercisable (in Shares) | shares	1,443
Weighted Average Exercise Price
Weighted average exercise price, beginning balance (in Dollars per share) | $ / shares	$ 20.33
Granted (in Dollars per share) | $ / shares	24.15
Exercised (in Dollars per share) | $ / shares	6.50
Forfeited (in Dollars per share) | $ / shares	28.51
Weighted average exercise price, ending balance (in Dollars per share) | $ / shares	26.11	$ 20.33
Weighted average exercise price, exercisable (in Dollars per share) | $ / shares	$ 21.78
Weighted Average Remaining Contractual Term (Years)	4 years 9 months 18 days	3 years 4 months 28 days
Weighted Average Remaining Contractual Term, exercisable (Years)	2 years 10 months 8 days
Aggregate Intrinsic Value (in thousands) | $	$ 9,582	$ 80,868
Aggregate Intrinsic Value, exercisable (in thousands) | $	$ 9,681