Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Stockholders' Equity Attributable to Parent	$ 313,291	$ 293,735
Accumulated Translation Adjustment [Member]
Stockholders' Equity Attributable to Parent	1,489	2,742
Net current period other comprehensive gain (loss)	(1,253)
Reclassification of accumulated other comprehensive income (loss)	0
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Stockholders' Equity Attributable to Parent	(8)	37
Net current period other comprehensive gain (loss)	(45)
Reclassification of accumulated other comprehensive income (loss)	0
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity Attributable to Parent	1,481	$ 2,779
Net current period other comprehensive gain (loss)	(1,298)
Reclassification of accumulated other comprehensive income (loss)	$ 0