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Stock Options and Restricted Stock Awards (Details) (USD $)
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Stock Options [Member]
    
Summary of Black-Scholes option pricing model assumptions used to derive weighted average fair value of stock options granted [Abstract]    
Weighted average risk free interest rate (in hundredths) 1.75% 1.39%
Weighted average expected holding period (years) 5 years 0 months 4 days 7 years 0 months 4 days
Weighted average expected volatility (in hundredths) 46.02% 44.21%
Weighted average expected dividend yield (in hundredths) 0.00% 0.00%
Weighted average fair value of options granted (in dollars per share) $ 9.65 $ 2.96
Number of Shares [Roll Forward]    
Outstanding at beginning of period (in shares) 1,426,968  
Granted (in shares) 82,537 6,000
Exercised (in shares) 0  
Cancelled (in shares) (7,250)  
Outstanding at end of period (in shares) 1,502,255  
Weighted Average Exercise Price [Roll Forward]    
Outstanding at beginning of period (in dollars per share) $ 9.21  
Granted (in dollars per share) $ 22.99  
Exercised (in dollars per share) $ 0  
Cancelled (in dollars per share) $ 10.81  
Outstanding at end of period (in dollars per share) $ 9.96  
Number of stock options exercisable (in shares) 933,016  
Weighted average exercise price of stock options exercisable (in dollars per share) $ 9.04  
Number of Shares [Roll Forward]    
Non-vested at beginning of period (in shares) 490,702  
Granted (in shares) 82,537 6,000
Vested (in shares) (4,000)  
Cancelled (in shares) 0  
Non-vested at end of period (in shares) 569,239  
Weighted Average Grant Date Fair Value [Roll Forward]    
Non-vested at beginning of period (in dollars per share) $ 4.39  
Granted (in dollars per share) $ 9.65 $ 2.96
Vested (in dollars per share) $ 3.00  
Cancelled (in dollars per share) $ 0  
Non-vested at end of period (in dollars per share) $ 5.16  
Total unrecognized compensation expense $ 2,301,000  
Weighted average vesting period over which compensation expense is expected to be recognized 1 year 10 months 24 days  
Restricted Stock Units (RSUs) [Member]
    
Weighted Average Grant Date Fair Value [Roll Forward]    
Weighted average vesting period over which compensation expense is expected to be recognized 2 years 6 months  
Summary of restricted stock transactions [Abstract]    
Number of equal annual installments in which awards vest 3  
Fair value to be recognized as compensation expense 2,316,000  
Number of Shares [Roll Forward]    
Non-vested RSU's at beginning of period (in shares) 138,000  
RSU's granted (in shares) 95,645  
RSU's vested (in shares) (4,400)  
RSU's cancelled (in shares) 0  
Non-vested RSU's at end of period (in shares) 229,245  
Weighted Average Grant Date Fair Value [Roll Forward]    
Non-vested RSU's at beginning of period (in dollars per share) $ 9.32  
RSU's granted (in dollars per share) $ 24.21  
RSU's vested (in dollars per share) $ 22.93  
RSU's cancelled (in dollars per share) $ 0  
Non-vested RSU's at end of period (in dollars per share) $ 15.27  
Total unrecognized compensation expense $ 3,171,000