Inventories - Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Inventories [Abstract]
Finished goods	$ 76,512	$ 79,583	$ 74,272	$ 76,194	$ 69,499	$ 66,598	$ 49,349	$ 21,639	$ 22,886
Work in process	8,905	10,309	8,628	10,032	4,075	4,574	5,074	3,539	3,883
Raw materials and supplies	99,899	85,959	73,416	63,177	61,623	60,944	59,243	36,835	29,213
Inventory, Net	$ 185,316	$ 175,851	$ 156,315	$ 149,403	$ 135,197	$ 132,116	$ 113,666	$ 62,013	$ 55,982