Stock-Based Compensation, (Non-vested Stock Granted) (Details) - Non-vested Stock [Member]	9 Months Ended
	Oct. 31, 2015 $ / shares shares
Non-vested Stock, Number of Shares [Roll Forward]
Beginning Balance (in shares) | shares	678,604
Granted (in shares) | shares	474,728
Number of shares vested (in shares) | shares	(264,402)
Forfeited (in shares) | shares	(38,768)
Ending Balance (in shares) | shares	850,162
Non-vested Stock, Weighted Average Grant Date Fair Value [Roll Forward]
Beginning Balance (in dollars per share) | $ / shares	$ 21.76
Granted (in dollars per share) | $ / shares	20.65
Vested (in dollars per share) | $ / shares	20.75
Forfeited (in dollars per share) | $ / shares	22.10
Ending Balance (in dollars per share) | $ / shares	$ 21.44