Stock-based Compensation Plans and Awards - Employee Stock Purchase Plan - (Details) - Employee Stock Purchase Plan	1 Months Ended	3 Months Ended
	May. 31, 2011	Mar. 31, 2016 item shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, discount from market price, lower of purchase and offer date	15.00%
Participants maximum payroll deductions percentage	15.00%
Duration of each offering period		12 months
Number of purchase periods in each offering period | item		2
Duration of each purchase period		6 months
Maximum number of common stock shares may be purchased by each participant		500
Number of common stock shares remaining authorized for issuance		1,700,000