Restructuring and Exit Costs (Schedule of Restructuring and Exit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Reserve [Roll Forward]
Costs incurred	$ 997	$ 188
Comprehensive 2017 Restructuring Plan
Restructuring Reserve [Roll Forward]
Costs incurred	1,000
Comprehensive 2017 Restructuring Plan | Employee Severance Costs
Restructuring Reserve [Roll Forward]
Costs incurred	997
Amounts paid	(308)
Accounts Payable and Accrued Liabilities | Comprehensive 2017 Restructuring Plan | Employee Severance Costs
Restructuring Reserve [Roll Forward]
Restructuring liability as of December 31, 2016	0
Restructuring liability as of March 31, 2017	$ 689