Goodwill and Intangible Assets (Summary of Intangible Assets) (Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) item	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Definite-lived intangible assets
Weighted-Average Life (Years)		12 years	12 years
Finite-Lived Intangible Assets, Gross	$ 34,557	$ 34,557	$ 30,572
Accumulated Amortization	24,079	24,079	23,622
Finite-Lived Intangible Assets, Net	10,478	10,478	6,950
Indefinite-lived intangible assets
Goodwill recognized	4,321	4,321	3,726	$ 4,467
Subtotal, Original Cost	33,546	33,546	32,951
Subtotal, Net Book Value	33,546	33,546	32,951
Balance, Original Cost	68,103	68,103	63,523
Balance, Net Book Value	$ 44,024	44,024	39,901
Number of Injectable Products Acquired | item	14
Number of Different Injectable Chemical Entities | item	11
Payment to Acquire Business, Gross	$ 4,000	4,761
Finished Pharmaceutical Products
Indefinite-lived intangible assets
Goodwill recognized	4,321	4,321
API
Indefinite-lived intangible assets
Goodwill recognized			3,726
Trademarks
Indefinite-lived intangible assets
Indefinite-lived intangible assets	29,225	$ 29,225	$ 29,225
Product rights
Definite-lived intangible assets
Weighted-Average Life (Years)		12 years	12 years
Finite-Lived Intangible Assets, Gross	27,134	$ 27,134	$ 27,134
Accumulated Amortization	23,124	23,124	22,679
Finite-Lived Intangible Assets, Net	4,010	$ 4,010	$ 4,455
Patents
Definite-lived intangible assets
Weighted-Average Life (Years)		10 years	10 years
Finite-Lived Intangible Assets, Gross	293	$ 293	$ 293
Accumulated Amortization	115	115	107
Finite-Lived Intangible Assets, Net	178	$ 178	$ 186
Trademarks
Definite-lived intangible assets
Weighted-Average Life (Years)		11 years	11 years
Finite-Lived Intangible Assets, Gross	15	$ 15	$ 15
Accumulated Amortization	15	$ 15	$ 15
Land-use rights
Definite-lived intangible assets
Weighted-Average Life (Years)		39 years	39 years
Finite-Lived Intangible Assets, Gross	2,540	$ 2,540	$ 2,540
Accumulated Amortization	304	304	288
Finite-Lived Intangible Assets, Net	2,236	2,236	$ 2,252
Acquired ANDAs
Definite-lived intangible assets
Finite-Lived Intangible Assets, Gross	4,000	4,000
Finite-Lived Intangible Assets, Net	4,000	$ 4,000
Other intangible assets
Definite-lived intangible assets
Weighted-Average Life (Years)		1 year	1 year
Finite-Lived Intangible Assets, Gross	575	$ 575	$ 590
Accumulated Amortization	521	521	533
Finite-Lived Intangible Assets, Net	$ 54	$ 54	$ 57