Mining Properties (Tables)

12 Months Ended

Dec. 31, 2018

Mining Properties [Abstract]

Mining Properties

Mining properties consist of the following (in thousands):

December 31, 2018	Palmarejo			Rochester			Silvertip			Kensington			Wharf			Sterling			La Preciosa		Other			Total
Mine development	$	239,780		$	200,126		$	101,933		$	324,414		$	41,761		$	4,070		$	—	$	—		$	912,084
Accumulated amortization	(163,414		)	(151,141		)	(1,411		)	(198,456		)	(18,759		)	(14		)	—		—			(533,195		)
	76,366			48,985			100,522			125,958			23,002			4,056			—		—			378,889
Mineral interests	629,303			18,521			252,899			—			45,837			95,499			49,085		5,171			1,096,315
Accumulated amortization	(472,448		)	—			(4,105		)	—			(26,667		)	—			—		(417		)	(503,637		)
	156,855			18,521			248,794			—			19,170			95,499			49,085		4,754			592,678
Mining properties, net	$	233,221		$	67,506		$	349,316		$	125,958		$	42,172		$	99,555		$	49,085	$	4,754		$	971,567

December 31, 2017	Palmarejo			Rochester			Silvertip		Kensington			Wharf			La Preciosa		Total
Mine development	$	214,383		$	193,881		$	57,214	$	298,749		$	40,618		$	—	$	804,845
Accumulated amortization	(146,598		)	(144,390		)	—		(178,632		)	(15,748		)	—		(485,368		)
	67,785			49,491			57,214		120,117			24,870			—		319,477
Mineral interests	629,303			—			245,116		—			45,837			49,085		969,341
Accumulated amortization	(435,215		)	—			—		—			(24,034		)	—		(459,249		)
	194,088			—			245,116		—			21,803			49,085		510,092
Mining properties, net	$	261,873		$	49,491		$	302,330	$	120,117		$	46,673		$	49,085	$	829,569