Goodwill and Identifiable Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Information on Identifiable Intangible Assets

Information on our identifiable intangible assets that are subject to amortization is presented in the table below.

		September 30, 2016						December 31, 2015
	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(in years)
Customer contractual relationships	17	$	554,330	$	152,199	$	402,131	$	554,330	$	127,264	$	427,066
Contractual Backlog	1		21,800		21,800		—		21,800		18,850		2,950
Technology	15		7,000		739		6,261		7,000		389		6,611
Total		$	583,130	$	174,738	$	408,392	$	583,130	$	146,503	$	436,627

Amortization Expense Recorded for Identifiable Intangible Assets

Our amortization expense recorded for our identifiable intangible assets is presented in the table below.

	Three Months Ended				Nine Months Ended
	September 30, 2016		September 30, 2015		September 30, 2016		September 30, 2015
Amortization expense	$	8,428	$	12,944	$	28,235	$	32,452