Intangible Asset (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Asset, Net

The following table summarizes the intangible asset balance as of December 31, 2015, and 2014:

	AT DEC. 31,
(THOUSANDS)	2015		2014
Gross carrying amount	$	177,537	$	177,537
Accumulated amortization	102,574		86,895
Intangible asset	$	74,963	$	90,642

Expected Amortization Expense

The following table summarizes the amortization expense expected to be recognized during each year through 2019:

YEAR ENDING DEC. 31,	(THOUSANDS)
Expected amortization expense
2016	$	16,864
2017	$	18,009
2018	$	19,312
2019	$	20,778