Employee Benefits - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Pension plan curtailment gain	$ 1.0
Period of unrecognized benefits associated with prior year plan amendments that would have been amortized into income	7 years
Number of consecutive years of employee's compensation		5 years
Number of total years of employee's compensation		10 years
Expected long-term rate of return on plan assets		7.50%