Significant Accounting Policies - Stock Repurchase Program - USD ($)	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2016
Accounting Policies [Abstract]
Stock Repurchase Program Authorization Date	Jul. 29, 2015
Share Repurchase		2,000,000
Stock Repurchase Program, Cumulative Shares Repurchased	1,216,243
Stock Repurchase Program Cumulative Cost	$ 10,800,000