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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Basic EPS [Abstract]
Weighted average common shares outstanding (in shares)	44,153,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	43,762,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net income available to common shareholders	$ 18,166us-gaap_NetIncomeLoss	$ 18,009us-gaap_NetIncomeLoss
Basic EPS (in dollars per share)	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic
Diluted EPS [Abstract]
Weighted average common shares outstanding (in shares)	44,153,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	43,762,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Dilutive effect of common stock options and restricted stock (in shares)	489,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	505,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common shares and common share equivalents (in shares)	44,642,000us-gaap_ProFormaWeightedAverageSharesOutstandingDiluted	44,267,000us-gaap_ProFormaWeightedAverageSharesOutstandingDiluted
Net income available to common shareholders	$ 18,166us-gaap_NetIncomeLoss	$ 18,009us-gaap_NetIncomeLoss
Diluted EPS (in dollars per share)	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from calculation of diluted EPS (in shares)	461,611us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember	479,543us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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