Significant Accounting Policies (Details 4) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) facility	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Geographic concentrations
Number of facilities to provide services | facility									28
Net property, plant and equipment	$ 23,924				$ 28,136				$ 23,924	$ 28,136
Revenues	110,107	$ 97,425	$ 97,317	$ 99,563	116,892	$ 108,784	$ 109,175	$ 109,315	404,412	444,166	$ 499,444
Domestic
Geographic concentrations
Net property, plant and equipment	19,810				24,695				19,810	24,695
Revenues									$ 324,625	377,717	427,535
Foreign
Geographic concentrations
Number of facilities to provide services | facility									4
Net property, plant and equipment	$ 4,114				3,441				$ 4,114	3,441
Revenues									$ 79,787	66,449	$ 71,909
Long-term debt | Accounting Standards Update 2015-03
New accounting pronouncements
Deferred finance costs, net					$ 200					$ 200