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Earnings Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basic and Diluted Earnings per Share [Line Items]    
Net income $ 23,679us-gaap_NetIncomeLoss $ 13,331us-gaap_NetIncomeLoss
Weighted-average common shares outstanding (in shares) 24,990,470us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 25,372,280us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted-average common share for EPS calculation (in shares) 25,104,783us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 25,590,207us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per common share (in dollars per share) $ 0.95us-gaap_EarningsPerShareBasic $ 0.53us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in dollars per share) $ 0.94us-gaap_EarningsPerShareDiluted $ 0.52us-gaap_EarningsPerShareDiluted
Awards excluded from diluted earnings per share calculation (in shares) 697,950us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount [1] 908,480us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount [1]
Restricted Stock Awards [Member]    
Basic and Diluted Earnings per Share [Line Items]    
Add dilutive effect of share-based awards outstanding (in shares) 114,313us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 102,635us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Stock Options [Member]    
Basic and Diluted Earnings per Share [Line Items]    
Add dilutive effect of share-based awards outstanding (in shares) 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 115,292us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
[1] Outstanding awards that are not "in-the-money" are excluded from the diluted earnings per share calculation because the effect of including them would have been anti-dilutive.