Condensed Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity Method Investment	$ 24,063		$ 22,817
Revenue Recognized Under Net Reporting Arrangements	10,400	$ 11,100
Kelko (Venezuela) [Member]
Schedule of Equity Method Investments [Line Items]
Effect Of Currency Conversion, Amount		$ 100
Effect Of Currency Conversion, Per Diluted Share		$ 0.01
Equity Method Investment	$ 300