Balance Sheet Details (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accounts receivable:
Accounts receivable		$ 93,287		$ 93,287		$ 94,379
Allowance for doubtful accounts		6,429		6,429		7,066
Inventories:
Finished goods		171,408		171,408		159,998
Work in process		1,610		1,610		1,183
Raw materials		4,535		4,535		4,944
Repair parts		10,915		10,915		10,763
Operating supplies		1,099		1,099		1,139
Total inventories, less loss provisions of $12,314 and $5,313		189,567		189,567		178,027
Inventory loss provisions		12,314		12,314		5,313
Accrued liabilities:
Accrued incentives		31,325		31,325		21,450
Other accrued liabilities		21,178		21,178		23,729
Total accrued liabilities		52,503		52,503		45,179
Product portfolio optimization	[1]	6,784	$ 0	6,784	$ 0
Trade receivables
Accounts receivable:
Accounts receivable		90,566		90,566		91,324
Other receivables
Accounts receivable:
Accounts receivable		$ 2,721		$ 2,721		$ 3,055

[1] Product portfolio optimization relates to inventory reductions to simplify and improve our operations.