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Consolidated Statements of Shareholders' Equity (USD $) In Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 333,142 us-gaap_StockholdersEquity | $ 74,878 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 258,264 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance, Shares at Dec. 31, 2011 |  | 24,576 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Net income | 44,777 us-gaap_NetIncomeLoss |  | 44,777 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Share-based compensation | 3,840 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 3,840 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | 5,841 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 5,841 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 355 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Excess tax benefit from equity awards | 1,033 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 1,033 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Taxes paid related to net share settlement of stock awards | (250)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | (250)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Dividends accrued of $0.94, $0.96, $0.98 per share in 2012,2013 and 2014 | (23,645)us-gaap_DividendsCommonStock |  | (23,645)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance at Dec. 31, 2012 | 364,738 us-gaap_StockholdersEquity | 85,342 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 279,396 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance, Shares at Dec. 31, 2012 |  | 24,931 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Net income | 43,397 us-gaap_NetIncomeLoss |  | 43,397 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Share-based compensation | 3,680 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 3,680 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | 15,067 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 15,067 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 826 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Excess tax benefit from equity awards | 1,329 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 1,329 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Taxes paid related to net share settlement of stock awards | (2,395)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | (2,395)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Dividends accrued of $0.94, $0.96, $0.98 per share in 2012,2013 and 2014 | (24,755)us-gaap_DividendsCommonStock |  | (24,755)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive loss | (31)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  | (31)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2013 | 401,030 us-gaap_StockholdersEquity | 103,023 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 298,038 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (31)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, Shares at Dec. 31, 2013 | 25,757 us-gaap_CommonStockSharesOutstanding | 25,757 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Balance at Sep. 30, 2013 | 395,694 us-gaap_StockholdersEquity |  |  |
Net income | 11,761 us-gaap_NetIncomeLoss |  |  |
Other comprehensive loss | (31)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  | (31)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2013 | 401,030 us-gaap_StockholdersEquity | 103,023 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 298,038 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (31)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, Shares at Dec. 31, 2013 | 25,757 us-gaap_CommonStockSharesOutstanding | 25,757 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Net income | 45,709 us-gaap_NetIncomeLoss |  | 45,709 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Share-based compensation | 3,854 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 3,854 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | 1,729 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 1,729 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 294 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Excess tax benefit from equity awards | 1,822 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 1,822 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Taxes paid related to net share settlement of stock awards | (3,959)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | (3,959)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Dividends accrued of $0.94, $0.96, $0.98 per share in 2012,2013 and 2014 | (25,583)us-gaap_DividendsCommonStock |  | (25,583)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive loss | (102)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  | (71)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2014 | 424,531 us-gaap_StockholdersEquity | 106,469 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 318,164 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (102)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, Shares at Dec. 31, 2014 | 26,051 us-gaap_CommonStockSharesOutstanding | 26,051 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Balance at Sep. 30, 2014 | 414,519 us-gaap_StockholdersEquity |  |  |
Net income | 13,887 us-gaap_NetIncomeLoss |  |  |
Other comprehensive loss | (102)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  | (71)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2014 | $ 424,531 us-gaap_StockholdersEquity |  |  | $ (102)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, Shares at Dec. 31, 2014 | 26,051 us-gaap_CommonStockSharesOutstanding |  |  |

X
- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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