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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]  
Valuation of marketable securities
 
December 31, 2015
 
Quoted Prices in Active Markets for Identical Instruments
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
Total
Marketable securities
$
16,895

 
$
—

 
$
—

 
$
16,895


 
December 31, 2014
 
Quoted Prices in Active Markets for Identical Instruments
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
Total
Marketable securities
$
15,378

 
$
—

 
$
—

 
$
15,378
Valuation of senior notes
 
December 31, 2015
 
December 31, 2014
 
Carrying Amount
 
Estimated Fair Value
 
Carrying Amount (1)
 
Estimated Fair Value
$500 million, 4.875% Senior Notes due 2021
$
495,951

 
$
542,078

 
$
495,144

 
$
566,700

$300 million, 4.625% Senior Notes due 2021
298,396

 
319,620

 
298,113

 
337,222

$300 million, 3.800% Senior Notes due 2022
297,535

 
303,595

 
297,215

 
310,749

$300 million, 3.850% Senior Notes due 2023
$
298,136

 
$
302,468

 
$
297,925

 
$
311,656

(1) 
Prior period amounts have been reclassified to conform to current period presentation, due to the Company's adoption of new accounting standards during the fourth quarter ended December 31, 2015, see Note 1 for further information.