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Basis of Presentation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014 item	Dec. 31, 2013
Description of Business
Number of operating segments			3us-gaap_NumberOfOperatingSegments
Computation of basic and diluted earnings per share
Net income for diluted earnings per share calculation	$ 18,241us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 14,573us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 29,490us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 20,967us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average shares for basic earnings per share calculation	19,811us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	19,961us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	19,815us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	19,966us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock awards (in shares)	676us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	628us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	691us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	638us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares for diluted earnings per share calculation	20,487us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	20,589us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	20,506us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	20,604us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net income per share (in dollars per share)	$ 0.92us-gaap_EarningsPerShareBasic	$ 0.73us-gaap_EarningsPerShareBasic	$ 1.49us-gaap_EarningsPerShareBasic	$ 1.05us-gaap_EarningsPerShareBasic
Diluted net income per share (in dollars per share)	$ 0.89us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted	$ 1.44us-gaap_EarningsPerShareDiluted	$ 1.02us-gaap_EarningsPerShareDiluted

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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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