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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator [Abstract]
Net income	$ 43,251us-gaap_NetIncomeLoss	$ 45,172us-gaap_NetIncomeLoss	$ 44,862us-gaap_NetIncomeLoss
Basic earnings per share [Abstract]
Weighted average shares (in shares)	17,326,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	17,158,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	17,013,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted earnings per share [Abstract]
Dilutive effect of equity grants (in shares)	71,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	82,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	60,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Adjusted weighted average shares (in shares)	17,397,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	17,240,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	17,073,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$ 2.50us-gaap_EarningsPerShareBasic	$ 2.63us-gaap_EarningsPerShareBasic	$ 2.64us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share)	$ 2.49us-gaap_EarningsPerShareDiluted	$ 2.62us-gaap_EarningsPerShareDiluted	$ 2.63us-gaap_EarningsPerShareDiluted
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from diluted calculations (in shares)	0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember	65,519us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember	98,720us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember
Weighted average price of outstanding options (in dollars per share)	$ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember	$ 35.409us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember	$ 35.409us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / 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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