Condensed Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity Method Investment	$ 23,448				$ 23,448		$ 20,354
Prior Period Reclassification Adjustment		$ 3,600
Revenue Recognized Under Net Reporting Arrangements	10,700		$ 12,100		32,800	$ 36,200
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	$ 100				$ 100		$ 200