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Consolidated Statements of Stockholders' Equity (USD $) | Total | Common Stock Shares [Member] | Non-Redeemable Preferred Stock [Member] | Capital in Excess of Par Value [Member] | Retained Earnings [Member] | Treasury Stock-Common [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 293,270,000 us-gaap_StockholdersEquity | $ 2,664,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 3,000,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_NonredeemablePreferredStockMember | $ 162,092,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 153,888,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (28,374,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance, shares at Dec. 31, 2011 |  | 26,638,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net income | 58,604,000 us-gaap_NetIncomeLoss |  |  |  | 58,604,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends paid on preferred stocks | (300,000)us-gaap_DividendsPreferredStockCash |  |  |  | (300,000)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock-based compensation | 1,652,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  | 1,652,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options | 767,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 9,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 758,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options, shares |  | 90,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Excess income tax benefit associated with stock-based compensation | 498,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  | 498,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Conversion of 68 shares of redeemable preferred stock to common stock | 6,000 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities |  |  | 6,000 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Conversion of redeemable preferred stock to common stock, shares |  | 3,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Balance at Dec. 31, 2012 | 354,497,000 us-gaap_StockholdersEquity | 2,673,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,000,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_NonredeemablePreferredStockMember | 165,006,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 212,192,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (28,374,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance, shares at Dec. 31, 2012 |  | 26,731,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net income | 54,962,000 us-gaap_NetIncomeLoss |  |  |  | 54,962,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends paid on preferred stocks | (300,000)us-gaap_DividendsPreferredStockCash |  |  |  | (300,000)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock-based compensation | 1,542,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  | 1,542,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options | 1,014,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 12,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 1,002,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options, shares |  | 115,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Balance at Dec. 31, 2013 | 411,715,000 us-gaap_StockholdersEquity | 2,685,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,000,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_NonredeemablePreferredStockMember | 167,550,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 266,854,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (28,374,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance, shares at Dec. 31, 2013 |  | 26,846,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net income | 19,634,000 us-gaap_NetIncomeLoss |  |  |  | 19,634,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends paid on preferred stocks | (300,000)us-gaap_DividendsPreferredStockCash |  |  |  | (300,000)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock-based compensation | 1,925,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  | 1,925,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options | 1,074,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 12,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 1,062,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options, shares | 121,742 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 122,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Balance at Dec. 31, 2014 | $ 434,048,000 us-gaap_StockholdersEquity | $ 2,697,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 3,000,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_NonredeemablePreferredStockMember | $ 170,537,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 286,188,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (28,374,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance, shares at Dec. 31, 2014 |  | 26,968,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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