Property, Plant and Equipment (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment
Depreciation expense	$ 220,600	$ 274,400	$ 233,400
Accounts payable for purchases of property and equipment	$ 3,400	2,400	38,500
Change in accounting principle, property plant and equipment estimated useful life	18 months
Increase in the cost of revenues		$ 41,919,000
Change in accounting principle remaining net book value of components			$ 16,406,000
Estimated weighted average remaining useful life			12 months
Change in accounting principle loss on disposition			$ 21,408,000