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Net Income Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Computation of basic and diluted net income per common share
Net income	$ 7,617us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 5,565us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average common shares outstanding during the period (for basic calculation)	39,498,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,372,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of other potential common shares	124,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	80,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares and potential common shares (for diluted calculation)	39,622,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,452,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per common share - Basic	$ 0.19us-gaap_EarningsPerShareBasic	$ 0.14us-gaap_EarningsPerShareBasic
Net income per common share - Diluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.14us-gaap_EarningsPerShareDiluted
Stock awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
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