Intangible Asset (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Asset, Net

The following table summarizes the intangible asset balance as of December 31, 2013 and 2012.

	AT DEC. 31,
(THOUSANDS)	2013		2012
Gross carrying amount	$	177,537	$	177,537
Accumulated amortization	71,530		56,992
Intangible asset	$	106,007	$	120,545

Expected Amortization Expense

The following table summarizes the amortization expense expected to be recognized during each year through 2018 and thereafter.

(THOUSANDS)
Expected amortization expense
2014	$	14,931
2015	15,876
2016	16,864
2017	18,009
2018	19,312
Thereafter	$	21,015