Stock Repurchase Program (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Stock repurchases	$ 57,423	$ 0	$ 0
Stock Repurchase Program, Authorized Amount	250,000
Dividend paid	$ 33,243	$ 34,164	$ 21,352
Treasury Stock, Shares, Acquired	1,507,766
Treasury Stock, Value, Acquired, Cost Method	$ 57,423