Restructuring Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring liability, beginning balance	$ 0	$ 0
Amounts expensed	1,428,000	219,000	$ 0
Amounts paid	(1,119,000)	(219,000)
Restructuring liability, ending balance	$ 309,000	$ 0	$ 0