Subsequent Events Subsequent Events (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Jan. 12, 2015 Y oz	Dec. 13, 2013	Apr. 16, 2013
Subsequent Event [Line Items]
Business Combination, Consideration Transferred, Cost of Acquired Entity		$ 34,652	$ 412,796
Subsequent Event [Member]
Subsequent Event [Line Items]
Acquisition agreement date	Jan. 12, 2015
Business Combination, Consideration Transferred, Cost of Acquired Entity	$ 105,000
Historical Production Life	30
Wharf ounces produced	2,000,000
Reserve Base of Wharf	560,000
Low End of Wharf Production Guidance	85,000
High End of Wharf Production Guidance	90,000