Stock Options, Restricted Stock Units and Employee Stock Purchase Plan - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		11 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Number of Options
Options outstanding, beginning balance (in Shares)	4,053,000
Granted (in Shares)	0		0
Exercised (in Shares)	(22,000)	(100,000)
Forfeited (in Shares)	(18,000)
Options outstanding, ending balance (in Shares)	4,013,000		4,013,000	4,053,000
Options, exercisable (in Shares)	2,114,000		2,114,000
Weighted Average Exercise Price
Weighted average exercise price, beginning balance (in Dollars per share)	$ 28.95
Granted (in Dollars per share)	0.00
Exercised (in Dollars per share)	24.99
Forfeited (in Dollars per share)	29.02
Weighted average exercise price, ending balance (in Dollars per share)	28.97		$ 28.97	$ 28.95
Weighted average exercise price, exercisable (in Dollars per share)	$ 29.18		$ 29.18
Weighted Average Remaining Contractual Term	4 years 3 months 25 days			4 years 6 months 22 days
Weighted Average Remaining Contractual Term, exercisable	3 years 10 months 10 days
Aggregate Intrinsic Value	$ 505		$ 505	$ 21,459
Aggregate Intrinsic Value, exercisable	$ 505		$ 505