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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Aug. 31, 2015
Sep. 30, 2016
Dec. 31, 2010
Senior Credit Facilities [Member]      
Debt Instrument [Line Items]      
Accordion credit   $ 300,000,000  
Net leverage ratio   5.35  
Proceeds from issuance of debt $ 395,000,000    
Commitment fee percentage   0.50%  
Percentage of capital stock of foreign restricted subsidiaries   65.00%  
Senior Credit Facilities [Member] | Federal Funds Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate   0.50%  
Senior Credit Facilities [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate   1.00%  
Senior Notes [Member]      
Debt Instrument [Line Items]      
Repurchase price percent equal of the principal amount, plus accrued and unpaid interest   101.00%  
Deferred Financing [Member]      
Debt Instrument [Line Items]      
Deferred financing obligations recorded at the present value of the scheduled payments   $ 8,500,000  
11% Senior Notes Due December 31, 2019 [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Stated interest rate   11.00%  
Maturity date   Dec. 31, 2019  
Long-term debt, effective interest rate   11.53%  
Long-term debt, face amount   $ 375,000,000  
11.25% Senior Notes Due December 31, 2020 [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Stated interest rate   11.25%  
Maturity date   Dec. 31, 2020  
Long-term debt, effective interest rate   11.85%  
Long-term debt, face amount   $ 375,000,000  
6% Senior Notes Due February 15, 2021 [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Stated interest rate   6.00%  
Maturity date   Feb. 15, 2021  
Long-term debt, effective interest rate   6.57%  
Long-term debt, face amount   $ 250,000,000  
Redemption period end date   Aug. 15, 2017  
Percentage of aggregate principal amount, plus a premium and accrued and unpaid interest that can be redeemed   100.00%  
Redemption price percentage   100.00%  
Senior Secured Revolving Credit Facility, Due August 3, 2018 [Member] | Senior Credit Facilities [Member]      
Debt Instrument [Line Items]      
Maturity date   Aug. 03, 2018  
Long-term debt, face amount   $ 96,600,000  
Senior Secured Revolving Credit Facility, Due November 2, 2016 [Member] | Senior Credit Facilities [Member]      
Debt Instrument [Line Items]      
Maturity date   Nov. 02, 2016  
Long-term debt, face amount   $ 28,400,000  
Data Sublicense Agreement [Member]      
Debt Instrument [Line Items]      
Payments due related to an asset acquired   $ 12,700,000 $ 65,000,000
Maximum [Member] | Senior Credit Facilities [Member]      
Debt Instrument [Line Items]      
Net leverage ratio   4.00  
Maximum [Member] | 6% Senior Notes Due February 15, 2021 [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Percentage of amount outstanding that can be redeemed   40.00%  
Revolving Credit Facility, Swingline Loans [Member] | Senior Credit Facilities [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 30,000,000  
Revolving Credit Facility, Letters Of Credit [Member] | Senior Credit Facilities [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 50,000,000  
Revolving Credit Facility [Member] | Senior Credit Facilities [Member]      
Debt Instrument [Line Items]      
Maturity date   Aug. 03, 2018  
Line of credit, amount borrowed   $ 2,985,000  
Revolving Credit Facility [Member] | Senior Credit Facilities [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate   2.50%  
LIBOR floor rate   0.00%  
Term Loan Facility [Member] | Senior Credit Facilities [Member]      
Debt Instrument [Line Items]      
Maturity date   Nov. 02, 2018  
Net cash proceeds of incurrence of debt, percentage   100.00%  
Percentage of annual excess cash flow   50.00%  
Percentage of annual excess cash flow based on first lien net leverage ratio   25.00%  
Reduced percentage of annual excess cash flow based on first lien net leverage ratio   0.00%  
Net cash proceeds of asset sales and casualty and condemnation events   100.00%  
Quarterly payment on original principal amount of loans   0.25%  
Term Loan Facility [Member] | Senior Credit Facilities [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate   2.50%  
LIBOR floor rate   1.25%  
Term Loan Facility [Member] | Senior Credit Facilities [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Long-term debt, effective interest rate   2.25%  
Term Loan Facility [Member] | Minimum [Member] | Senior Credit Facilities [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Long-term debt, effective interest rate   1.25%