Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Carrying Amounts, Estimated Fair Values and Valuation Input Levels of the Company's Senior Notes, Senior Secured Term Loans and Senior Secured Revolving Credit Facility

The carrying amounts, estimated fair values and valuation input levels of the Company’s available-for-sale securities, foreign currency contracts, senior notes, senior secured term loans and senior PIK toggle notes as of March 31, 2015 and December 31, 2014, are as follows:

 

     March 31, 2015      December 31, 2014         
     Carrying
Amount		      Fair Value      Carrying
Amount		      Fair Value      Valuation
Inputs		  

Assets:

               

Available-for-sale securities

    $ 15,427       $ 15,427      $ 20,392       $ 20,392         Level 1   

Foreign currency contracts

      2,323         2,323        1,165         1,165         Level 2   

Liabilities:

               

5.00% senior notes due 2021

      650,000         649,220        650,000         643,500         Level 2   

5.50% senior notes due 2024

      650,000         649,220         650,000         640,250         Level 2   

Senior secured term loans due 2017, at par

      344,750         344,535        345,625         342,169         Level 2   

Senior secured term loans due 2018, at par

      517,125         517,435         518,438         513,254         Level 2   

Senior PIK toggle notes due 2020

      550,000         565,125        550,000         566,500         Level 2   

Foreign currency contracts

      2,575         2,575         3,584         3,584         Level 2