Balance Sheet Details (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable:
Accounts receivable	$ 94,549	$ 80,850
Allowance for doubtful accounts	5,846	5,703
Inventories:
Finished goods	144,945	139,888
Work in process	1,615	1,188
Raw materials	4,558	4,828
Repair parts	10,550	10,283
Operating supplies	1,453	1,362
Total inventories, less loss provisions of $4,913 and $4,091	163,121	157,549
Inventory loss provision	4,913	4,091
Prepaid and other current assets:
Value added tax	6,697	3,850
Prepaid expenses	8,396	5,036
Deferred income taxes	5,840	4,070
Prepaid income taxes	3,511	0
Derivative asset	394	41
Total prepaid and other current assets	24,838	12,997
Other assets:
Deposits	919	936
Finance fees — net of amortization	10,472	13,539
Other assets	2,124	3,825
Total other assets	13,515	18,300
Accrued liabilities:
Accrued incentives	17,830	17,783
Workers compensation	7,108	7,128
Medical liabilities	3,433	3,537
Interest	3,331	3,732
Commissions payable	1,067	1,478
Contingency liability	0	2,719
Restructuring liability	289	0
Other accrued liabilities	8,360	6,486
Total accrued liabilities	41,418	42,863
Other long-term liabilities:
Deferred liability	7,424	5,591
Derivative liability	2,073	0
Other long-term liabilities	4,277	4,481
Total other long-term liabilities	13,774	10,072
Trade receivables [Member]
Accounts receivable:
Accounts receivable	87,499	79,624
Other receivables [Member]
Accounts receivable:
Accounts receivable	$ 7,050	$ 1,226