Acquisitions and Exit Activities Exit Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Loss on disposal, tax benefit	$ 0	$ 0	$ (1,404,000)
Ijie Operations
Restructuring Cost and Reserve [Line Items]
Disposal Group, Disposition of TK Investment, Percent of Issued Share Capital Sold	95.00%
Disposal Group, Including Discontinued Operation, Consideration	$ 1.00
Loss (Gain) on Write-down	1,100,000
Disposal costs	400,000
Cumulative translation adjustment	300,000
Loss on disposal, tax benefit	1,400,000
Loss on disposal, net of tax	3,200,000
Ijie Operations | Other Nonoperating Income (Expense)
Restructuring Cost and Reserve [Line Items]
Loss on disposal	$ 1,800,000
TK Investment
Restructuring Cost and Reserve [Line Items]
Investment Ownership Percentage	5.00%