Acquisitions (Consideration for the New Jersey Facility and the Preliminary Allocation of the Fair Value of Assets Acquired) (Details) - Jun. 30, 2015 - Princeton Facility [Member] - USD ($) $ in Thousands	Total
Business Acquisition [Line Items]
Buildings	$ 32,126
Land	20,700
Acquired intangibles	30,634
Deferred costs	3,290
Other	297
Intangible liabilities	(13,747)
Total purchase price	$ 73,300
Buildings, Weighted average useful life	40 years
Intangible liabilities, Weighted average useful life	17 years
Deferred Costs [Member]
Business Acquisition [Line Items]
Deferred costs, Weighted average useful life	10 years
Other [Member]
Business Acquisition [Line Items]
Other assets, Weighted average useful life	10 years
Acquisition Related Intangibles [Member]
Business Acquisition [Line Items]
Intangible assets, Weighted average useful life	13 years