Condensed Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity Method Investment	$ 21,194		$ 20,354
Prior Period Reclassification Adjustment	3,600
Revenue Recognized Under Net Reporting Arrangements	11,100	$ 11,900
Kelko (Venezuela) [Member]
Schedule of Equity Method Investments [Line Items]
Effect Of Currency Conversion, Amount	$ 100	$ 2,800
Effect Of Currency Conversion, Per Diluted Share	$ 0.01	$ 0.21
Equity Method Investment	$ 200		$ 200