Equity - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Feb. 29, 2016	Aug. 31, 2015
Stockholders Equity Note [Line Items]
Stock Repurchased During Period, Value		$ 25,107,000	$ 88,785,000
Share Repurchase Plan, August 2015
Stockholders Equity Note [Line Items]
Stock repurchase program, authorized amount						$ 100,000,000
Share repurchased during period (in shares)	839,130
Stock Repurchased During Period, Value	$ 11,000,000
Share Repurchase Plan, February 2016
Stockholders Equity Note [Line Items]
Stock repurchase program, authorized amount					$ 100,000,000
Share repurchased during period (in shares)		1,103,924
Stock Repurchased During Period, Value		$ 14,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 86,000,000
Convertible debt securities
Stockholders Equity Note [Line Items]
Securities excluded in the calculation of diluted earnings per share		0	21,292,309	12,811,041
Equity awards
Stockholders Equity Note [Line Items]
Securities excluded in the calculation of diluted earnings per share		0	103,253	59,230