Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 15,131	$ 15,131
Accumulated Amortization	(15,131)	(14,654)
Total	0	477
Estimated Future Amortization Expense [Abstract]
2017	0
2018	0
2019	0
2020	0
2021	0
2022 and thereafter	0
Amortization expense	500	500	$ 500
Intangible assets not subject to amortization	29,000	29,000
TPHS Business [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		81,658
Accumulated Amortization		(49,867)
Total		31,791
Customer Contracts [Member] | TPHS Business [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		12,170
Accumulated Amortization		(12,044)
Total		126
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,422	6,422
Accumulated Amortization	(6,422)	(6,422)
Total	0	0
Acquired Technology [Member] | TPHS Business [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		12,126
Accumulated Amortization		(11,525)
Total		601
Patents [Member] | TPHS Business [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		24,832
Accumulated Amortization		(19,121)
Total		5,711
Distributor and Provider Networks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,709	8,709
Accumulated Amortization	(8,709)	(8,232)
Total	$ 0	477
Perpetual License to Survey-Based Data [Member] | TPHS Business [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		32,000
Accumulated Amortization		(6,695)
Total		25,305
Other [Member] | TPHS Business [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		530
Accumulated Amortization		(482)
Total		$ 48