Other Income (Expense), Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Income and Expenses [Abstract]
Accrual for loss related to legal proceedings (Footnote 6)	$ 0	$ 0	$ (5,000)	$ 0
Loss on bond exchange	0	(2,182)	0	(2,182)
Other income, net	192	465	124	585
Total other income (expense), net	$ 192	$ (1,717)	$ (4,876)	$ (1,597)