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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Consolidated Balance Sheets [Abstract] |  |
Allowance for doubtful accounts, accounts receivable | $ 2,918 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 2,943 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment | $ 369,128 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | $ 362,620 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Preferred shares, par value | $ 0.1 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.1 us-gaap_PreferredStockParOrStatedValuePerShare
Preferred shares, shares authorized | 5,000 us-gaap_PreferredStockSharesAuthorized | 5,000 us-gaap_PreferredStockSharesAuthorized
Preferred shares, issued | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued
Common shares, par value | $ 0.1 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.1 us-gaap_CommonStockParOrStatedValuePerShare
Common shares, shares authorized | 145,000 us-gaap_CommonStockSharesAuthorized | 145,000 us-gaap_CommonStockSharesAuthorized
Common shares, issued | 52,478 us-gaap_CommonStockSharesIssued | 52,994 us-gaap_CommonStockSharesIssued
Common shares, outstanding | 52,478 us-gaap_CommonStockSharesOutstanding | 52,994 us-gaap_CommonStockSharesOutstanding

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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