Debt and Other Long-Term Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Debt and Other Long Term Liabilities

	Debt														Other Liabilities							Total
	Senior Notes						Credit Facility					Total Debt			Capital Lease Obligations			Asset retirement obligations		Other long-term liabilities
Dollars in thousands	2019 Notes			2021 Notes			Term Loans			Revolving Line of Credit
As of December 31, 2015:
Principal	$	350,000		$	258,908		$	136,875		$	140,500	$	886,283
Discount	(3,275		)	(3,029		)	(260		)	—		(6,564		)
Total	346,725			255,879			136,615			140,500		879,719			$	5,889		$	9,412	$	19,477	$	914,497
Less: current portion	—			—			(13,125		)	—		(13,125		)	(4,006		)	—		—		(17,131		)
Total long-term portion	$	346,725		$	255,879		$	123,490		$	140,500	$	866,594		$	1,883		$	9,412	$	19,477	$	897,366
Unamortized deferred financing fees(1)	$	495		$	1,054		$	—		$	2,300	$	3,849									$	3,849

	Debt														Other Liabilities							Total
	Senior Notes						Credit Facility					Total Debt			Capital Lease Obligations			Asset retirement obligations		Other long-term liabilities
Dollars in thousands	2019 Notes			2021 Notes			Term Loans			Revolving Line of Credit
As of December 31, 2014:
Principal	$	350,000		$	300,000		$	146,250		$	160,000	$	956,250
Discount	(4,296		)	(4,152		)	(335		)	—		(8,783		)
Total	345,704			295,848			145,915			160,000		947,467			$	15,391		$	13,576	$	17,651	$	994,085
Less: current portion	—			—			(9,390		)	—		(9,390		)	(11,026		)	—		—		(20,416		)
Total long-term portion	$	345,704		$	295,848		$	136,525		$	160,000	$	938,077		$	4,365		$	13,576	$	17,651	$	973,669
Unamortized deferred financing fees(1)	$	649		$	1,372		$	—		$	2,965	$	4,986									$	4,986

(1) Deferred financing fees are recorded in other long-term assets in our Consolidated Balance Sheets and are amortized on a straight line basis over the life of the related loan.

Interest Expense

Interest Expense

Dollars in thousands	Year Ended December 31,
	2015			2014		2013
Cash interest expense	$	45,507		$	41,562	$	25,289
Non-cash interest expense:
Amortization of debt discount	1,731			2,606		4,674
Amortization of deferred financing fees	1,030			1,510		1,720
Other	—			—		(550		)
Total non-cash interest expense	2,761			4,116		5,844
Total cash and non-cash interest expense	48,268			45,678		31,133
(Gain) loss from early extinguishment of debt	(5,854		)	2,018		6,013
Total interest expense	$	42,414		$	47,696	$	37,146

Maturities of Term Loan

The Amended and Restated Credit Agreement requires principal amortization payments under the Term Loan as follows:

Dollars in thousands	Repayment Amount
2016	$	13,125
2017	15,000
2018	18,750
2019	90,000
Total	$	136,875

Other Long-term Liabilities

Included in other long-term liabilities were primarily tenant improvements related to our office building renovation in Oakbrook Terrace, Illinois; Bellevue, Washington; and San Diego, California as well as the related unrecognized tax benefits as follows:

Dollars in thousands	December 31,
	2015		2014
Tenant improvement and deferred rent and other	$	12,592	$	13,012
Unrecognized tax benefit	6,885		4,639
Total other long-term liabilities	$	19,477	$	17,651