Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Measurement Inputs, Disclosure [Text Block]

The following table provides the assets and liabilities carried at fair value measured on a recurring basis. 

	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)
Available for sale securities	$	41,233	$	8,785	$	32,448	$	—
	$	41,233	$	8,785	$	32,448	$	—

	Fair value measurements at December 31, 2014 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)
Available for sale securities	$	70,952	$	5,884	$	65,068	$	—
	$	70,952	$	5,884	$	65,068	$	—

Fair Value Measurements, Nonrecurring [Table Text Block]

The following table provides the assets and liabilities carried at fair value measured on a non-recurring basis. 

	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