Segment Information - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
REVENUES, NET:
Revenues	$ 186,057	$ 202,428	$ 199,140	$ 253,420	$ 283,667	$ 284,095	$ 280,734	$ 268,347	$ 841,045	$ 1,116,843	$ 985,076
GROSS PROFIT:
Gross Profit	$ 83,085	$ 97,963	$ 102,967	$ 149,132	$ 169,254	$ 170,227	$ 171,773	$ 163,017	433,147	674,271	596,012
Prescription Pharmaceuticals
REVENUES, NET:
Revenues									772,524	1,053,579	924,472
GROSS PROFIT:
Gross Profit									403,023	645,078	566,298
Consumer Health
REVENUES, NET:
Revenues									68,521	63,264	60,604
GROSS PROFIT:
Gross Profit									$ 30,124	$ 29,193	$ 29,714