Restructuring and Exit Costs (Schedule of Restructuring and Exit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Costs incurred	$ 0	$ 109	$ 997	$ 297
Comprehensive 2017 Restructuring Plan
Restructuring Reserve [Roll Forward]
Costs incurred	0		1,000
Comprehensive 2017 Restructuring Plan | Employee Severance Costs
Restructuring Reserve [Roll Forward]
Restructuring liability as of December 31, 2016			0
Costs incurred			997
Amounts paid			(600)
Restructuring liability as of June 30, 2017	$ 397		$ 397