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Stock-Based Compensation (Details 3) - Jun. 30, 2015 - Stock Option Plans - $ / shares
Total
Stock-Based Compensation  
Outstanding Number of Shares 363,101
Exercisable Number of Shares 239,367
Exercise Price Per Share $31.00  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 31.00
Remaining Contractual Life 9 months
Outstanding Number of Shares 10,000
Exercisable Number of Shares 10,000
Exercise Price Per Share $72.93  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 72.93
Remaining Contractual Life 1 year 9 months
Outstanding Number of Shares 47,500
Exercisable Number of Shares 47,500
Exercise Price Per Share $54.00  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 54.00
Remaining Contractual Life 2 years 9 months
Outstanding Number of Shares 58,000
Exercisable Number of Shares 58,000
Exercise Price Per Share $46.83  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 46.83
Remaining Contractual Life 3 years 3 months
Outstanding Number of Shares 20,000
Exercisable Number of Shares 20,000
Exercise Price Per Share $17.82  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 17.82
Remaining Contractual Life 3 years 9 months
Outstanding Number of Shares 12,084
Exercisable Number of Shares 12,084
Exercise Price Per Share $34.00  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 34.00
Remaining Contractual Life 4 years 6 months
Outstanding Number of Shares 12,400
Exercisable Number of Shares 12,400
Exercise Price Per Share $40.26  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 40.26
Remaining Contractual Life 5 years 5 months 1 day
Outstanding Number of Shares 19,667
Exercisable Number of Shares 19,667
Exercise Price Per Share $55.88  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 55.88
Remaining Contractual Life 6 years 5 months 1 day
Outstanding Number of Shares 19,700
Exercisable Number of Shares 19,700
Exercise Price Per Share $47.96  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 47.96
Remaining Contractual Life 7 years 5 months 1 day
Outstanding Number of Shares 35,600
Exercisable Number of Shares 23,734
Exercise Price Per Share $48.39  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 48.39
Remaining Contractual Life 7 years 5 months 1 day
Outstanding Number of Shares 1,800
Exercisable Number of Shares 1,200
Exercise Price Per Share $52.78  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 52.78
Remaining Contractual Life 8 years 5 months 1 day
Outstanding Number of Shares 45,250
Exercisable Number of Shares 15,082
Exercise Price Per Share $46.72  
Stock-Based Compensation  
Exercise Price Per Share (in dollars per share) $ 46.72
Remaining Contractual Life 9 years 5 months 1 day
Outstanding Number of Shares 81,100