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Note 5 - Receivables (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Gross trade receivables $ 238,368us-gaap_AccountsReceivableGrossCurrent $ 299,962us-gaap_AccountsReceivableGrossCurrent
Allowance for doubtful accounts (6,232)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (5,458)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Net trade receivables 232,136us-gaap_AccountsReceivableNetCurrent 294,504us-gaap_AccountsReceivableNetCurrent
Other receivables 28,582us-gaap_OtherReceivablesNetCurrent 24,096us-gaap_OtherReceivablesNetCurrent
Total receivables, net $ 260,718us-gaap_AccountsAndOtherReceivablesNetCurrent $ 318,600us-gaap_AccountsAndOtherReceivablesNetCurrent