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Earnings Per Common Share (Computation Of Basic And Diluted Net Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income (Numerator) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 15,472 us-gaap_NetIncomeLoss |  | $ (22,182)us-gaap_NetIncomeLoss |  | $ 13,921 us-gaap_NetIncomeLoss |  | $ 14,639 us-gaap_NetIncomeLoss |  | $ 5,452 us-gaap_NetIncomeLoss |  | $ 13,790 us-gaap_NetIncomeLoss |  | $ 12,933 us-gaap_NetIncomeLoss |  | $ 14,954 us-gaap_NetIncomeLoss |  | $ 21,850 us-gaap_NetIncomeLoss | $ 47,129 us-gaap_NetIncomeLoss | $ 44,214 us-gaap_NetIncomeLoss
Basic earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,850 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 47,129 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 44,214 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Diluted earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,850 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 47,129 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 44,214 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Shares (Denominator) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share, Shares (Denominator) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,616 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 69,206 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 67,511 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities, options and restricted stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 725 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 839 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 974 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted earnings per common share (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71,341 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 70,045 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 68,485 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per-share Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share (in dollars per share) | $ 0.22 us-gaap_EarningsPerShareBasic | [1] | $ (0.31)us-gaap_EarningsPerShareBasic | [1] | $ 0.20 us-gaap_EarningsPerShareBasic | [1] | $ 0.21 us-gaap_EarningsPerShareBasic | [1] | $ 0.08 us-gaap_EarningsPerShareBasic | [1] | $ 0.20 us-gaap_EarningsPerShareBasic | [1] | $ 0.19 us-gaap_EarningsPerShareBasic | [1] | $ 0.22 us-gaap_EarningsPerShareBasic | [1] | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.68 us-gaap_EarningsPerShareBasic | $ 0.65 us-gaap_EarningsPerShareBasic
Effect of dilutive securities, options and restricted stock (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare | $ (0.01)us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare
Diluted earnings per common share (in dollars per share) | $ 0.22 us-gaap_EarningsPerShareDiluted | [1] | $ (0.31)us-gaap_EarningsPerShareDiluted | [1] | $ 0.20 us-gaap_EarningsPerShareDiluted | [1] | $ 0.21 us-gaap_EarningsPerShareDiluted | [1] | $ 0.08 us-gaap_EarningsPerShareDiluted | [1] | $ 0.20 us-gaap_EarningsPerShareDiluted | [1] | $ 0.19 us-gaap_EarningsPerShareDiluted | [1] | $ 0.22 us-gaap_EarningsPerShareDiluted | [1] | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted | $ 0.65 us-gaap_EarningsPerShareDiluted
Options outstanding to purchase common stock excluded from computation of diluted earnings per common share (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 494 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 546 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 576 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
[1] | Year-to-date earnings and cash dividends per common share amounts may differ from the sum of quarterly amounts due to rounding.

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