Debt (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Long term debt and capital lease obligations

The current and non-current portions of long-term debt and capital lease obligations at December 31, 2013 and December 31, 2012 are as follows (in thousands):

	December 31, 2013				December 31, 2012
	Current		Non-Current		Current		Non-Current
3.25% Convertible Senior Notes due 2028	$	—	$	5,334	$	48,081	$	—
7.875% Senior Notes due 2021	—		300,000		—		—
Capital lease obligations	2,505		796		7,902		3,460
	$	2,505	$	306,130	$	55,983	$	3,460

Interest expenses incurred for various debt instruments

	Years Ended December 31,
	2013			2012			2011
	(in thousands)
3.25% Convertible Senior Notes due 2028	$	466		$	1,581		$	1,581
7.875 % Senior Notes due 2021	21,853			—			—
Revolving Credit Facility	612			213			—
1.25% Convertible Senior Notes due 2024 (terminated in 2011)	—			—			1
Senior Term Notes (terminated in 2011)	—			—			1,381
Kensington Term Facility (terminated in 2012)	—			2,339			4,383
Capital lease obligations	415			997			1,620
Other debt obligations	291			881			1,379
Accretion of Franco Nevada royalty obligation	17,641			19,139			22,230
Amortization of debt issuance costs	2,143			1,146			2,050
Accretion of debt discount	576			2,536			2,324
Capitalized interest	(2,694		)	(2,663		)	(2,175		)
Total interest expense, net of capitalized interest	$	41,303		$	26,169		$	34,774