Accrued Payroll and Employee Benefits Accrued Payroll and Employee Benefits - Severance Cost Schedule (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]
Balance, beginning of period	$ 1,632	$ 2,370	$ 1,440	$ 4,148
Adjustments to expense	304	(20)	1,494	(197)
Payments	(639)	(1,349)	(1,637)	(2,950)
Balance, end of period	$ 1,297	$ 1,001	$ 1,297	$ 1,001