Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 154,372	$ 136,416	$ 136,756
Less - Accumulated depreciation and amortization	(102,904)	(100,652)	(100,758)
Net property, plant and equipment	51,468	35,764	35,998
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	7,052	5,838	5,818
Buildings, leasehold interests and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	45,009	40,661	40,257
Machinery, equipment and other
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 102,311	$ 89,917	$ 90,681