Summary of Business Organization, Operations and Significant Accounting Policies (Lease Revenue) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) facility extension	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Future minimum rentals on lease
2017	$ 5,329
2018	351
Total	$ 5,680
Number of owned facilities leased to an unrelated party | facility	3
Carrying value of leased facility	$ 31,600	$ 33,700
Accumulated depreciation of leased facility	9,000	8,100
Rental income received on lease	$ 4,700	$ 4,700	$ 4,600
Leased Facility 1
Future minimum rentals on lease
Period of lease	10 years
Number of extensions for leases | extension	3
Period of lease extension option	P5Y
Leased Facility 2
Future minimum rentals on lease
Period of lease	1 year
Number of extensions for leases | extension	3
Period of lease extension option	P1Y