Credit Facility and Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The carrying values and associated effective interest rates for our Long-term debt were as follows:

(In thousands, except rates)	Effective Interest Rate	December 31, 2014		December 31, 2013
2013 Senior Notes due November 15, 2018 at 2.50%	2.71%	$	597,557	$	596,920
2013 Senior Notes due November 15, 2023 at 4.10%	4.29%	395,559		395,056
2012 Senior Notes due May 15, 2017 at 1.75%	1.94%	499,643		499,490
Total long-term debt		$	1,492,759	$	1,491,466

Schedule of Carrying Values of Debt Instruments

The carrying values of the Notes are reflected in our consolidated balance sheets as follows:

	2.50% Notes						4.10% Notes						1.75% Notes
(In thousands)	December 31, 2014			December 31, 2013			December 31, 2014			December 31, 2013			December 31, 2014			December 31, 2013
Principal amount	$	600,000		$	600,000		$	400,000		$	400,000		$	500,000		$	500,000
Unamortized discount	(2,443		)	(3,080		)	(4,441		)	(4,944		)	(357		)	(510		)
Net carrying value	$	597,557		$	596,920		$	395,559		$	395,056		$	499,643		$	499,490

Schedule of Interest Expense, Debt Instruments

Interest expense related to the Notes were included in Interest expense in the consolidated statements of comprehensive income as follows:

(In thousands)	2014		2013		2012
Contractual coupon interest	$	40,155	$	14,043	$	5,682
Amortization of debt issuance costs	1,822		1,114		648
Amortization of debt discount	1,293		343		102
Total interest expense related to the Notes	$	43,270	$	15,500	$	6,432

Schedule of Maturities of Long-term Debt

As of December 31, 2014, future principal payments for the Notes were as follows:

Fiscal Year	Payable
	(In thousands)
2015	$	—
2016	—
2017	500,000
2018	600,000
2019	—
2020 and thereafter	400,000
Total	$	1,500,000

Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis

The estimated fair value of the Notes is as follows:

	2.50% Notes				4.10% Notes				1.75% Notes
(In thousands)	December 31, 2014		December 31, 2013		December 31, 2014		December 31, 2013		December 31, 2014		December 31, 2013
Estimated fair value	$	606,564	$	598,836	$	417,480	$	392,680	$	501,460	$	501,310