Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

The following tables provide the assets and liabilities carried at fair value measured on a recurring basis for the periods indicated (in thousands):

	Fair value measurements at September 30, 2016 using
	Total carrying value		Quoted prices in active markets for identical assets (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)
Short-term available for sale securities	$	49,475	$	13,645	$	35,830	$	—
Long-term available for sale securities	57,162		17,206		39,956		—
Total available for sale securities	$	106,637	$	30,851	$	75,786	$	—

	Fair value measurements at December 31, 2015 using
	Total carrying value		Quoted prices in active markets for identical assets (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)
Short-term available for sale securities	$	41,233	$	8,785	$	32,448	$	—
	$	41,233	$	8,785	$	32,448	$	—

Fair Value Measurements, Nonrecurring [Table Text Block]

The following tables provide the assets and liabilities carried at fair value on a non-recurring basis for the periods indicated (in thousands):

	Fair value measurements at September 30, 2016 using
	Total carrying value		Quoted prices in active markets for identical assets (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)
Assets held for sale	$	4,249	$	—	$	—	$	4,249
	$	4,249	$	—	$	—	$	4,249

	Fair value measurements at December 31, 2015 using
	Total carrying value		Quoted prices in active markets for identical assets (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)
Assets held for sale	$	4,134	$	—	$	—	$	4,134
	$	4,134	$	—	$	—	$	4,134