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Long-term Debt - Textual (Details)		1 Months Ended						3 Months Ended				12 Months Ended
	Sep. 29, 2017 USD ($)	May 31, 2017 USD ($) shares	Sep. 30, 2016 USD ($)	May 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Nov. 30, 2013 USD ($) shares	Dec. 31, 2018 USD ($)	Mar. 31, 2017 shares	May 31, 2016 USD ($)	Dec. 31, 2013	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Sep. 01, 2019	Jul. 01, 2017	May 01, 2017	Mar. 31, 2016	Aug. 31, 2015 USD ($)	Jan. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2012 USD ($)	Sep. 11, 2012
Debt Instrument [Line Items]
Loss on early extinguishment of debt												$ 0	$ 10,700,000	$ 7,400,000
Senior secured leverage ratio maximum								2				2
Repayments made on debt												$ 20,600,000	129,900,000	202,100,000
Conversion of convertible debt												$ 0	$ 319,400,000	$ 0
Conversion of convertible debt, net of tax (shares) | shares													8,900,000
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | shares												0	4,000,000	8,500,000
Capital Lease Obligations [Member] | Minimum [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)								2.00%				2.00%
Capital Lease Obligations [Member] | Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)								11.00%				11.00%
Term Loan Facilities [Member]
Debt Instrument [Line Items]
Maximum leverage ratio under the financial covenants								4.50				4.50
Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price, (percent)												101.00%
Convertible Preferred Stock [Member]
Debt Instrument [Line Items]
Shares exchanged for convertible debt (shares) | shares							257,110
Convertible debt dividend rate (percent)							6.50%
Term Loan Facilities [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Repayments of Debt	$ 110,000,000
The 2015 & 2016 Credit Agreement [Member] [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity													$ 500,000,000
Percentageof aggregate principal amount outstanding (percent)						1.25%
Senior secured leverage ratio maximum								1.75				1.75
Maximum leverage ratio under the financial covenants													4.50			4.25
The 2015 & 2016 Credit Agreement [Member] [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity													$ 260,000,000
The 2015 & 2016 Credit Agreement [Member] [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity													$ 600,000,000
5.75% Senior Notes Due 2025 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount					$ 350,000,000
Debt instrument maturity date					Sep. 15, 2025
Effective interest rate (percent)					6.00%
Debt instrument interest rate (percent)								5.75%				5.75%	5.75%					5.75%
The Credit Agreement [Member]
Debt Instrument [Line Items]
Amounts outstanding under letter of credit facility								$ 37,400,000				$ 37,400,000	$ 35,400,000
The Credit Agreement [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity	$ 300,000,000
Percentageof aggregate principal amount outstanding (percent)								1.25%				1.25%
Commitment fee (percent)	0.375%
Senior secured leverage ratio maximum	2.00
Payment limit under the credit agreement's negative covenant												$ 200,000,000
The Credit Agreement [Member] | Federal Funds Effective Swap Rate [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Spread on variable rate (percent)	0.50%							1.50%
The Credit Agreement [Member] | Scenario, Forecast [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Maximum leverage ratio under the financial covenants															4.25
The Credit Agreement [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity	$ 260,000,000
The Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity	$ 700,000,000
Applicable interest rate under credit facility (percent)								3.90%				3.90%	3.10%
5.75% Senior Notes Due 2024 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount																			$ 350,000,000	$ 400,000,000	$ 175,000,000	$ 275,000,000
Debt issue price as percentage of principal (percent)																			100.50%	102.00%	103.625%
Debt instrument maturity date											Nov. 01, 2024
Effective interest rate (percent)																							5.80%
Debt instrument interest rate (percent)								5.75%				5.75%	5.75%										5.75%
Former 2022 Notes | Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price, (percent)			102.583%							103.875%
Repayments made on debt			$ 78,000,000							$ 104,000,000
Debt redeemed			$ 76,000,000	$ 50,000,000
Effective interest rate (percent)			7.90%
5.125% Senior Notes Due 2023 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount						$ 300,000,000
Net proceeds for offering						$ 295,000,000
Effective interest rate (percent)						5.40%
Debt instrument interest rate (percent)								5.125%				5.125%	5.125%					5.125%
Senior Notes; Due 2020 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt redeemed										$ 50,000,000
2.00% Convertible Senior Subordinated Notes due 2043 [Member] | Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Repayments of Debt		$ 600,000
Aggregate principal amount							$ 320,000,000
Effective interest rate (percent)																	6.00%
Debt instrument conversion rate		27.2221 shares per $1,000 principal amount
Conversion of convertible debt		$ 319,400,000
Conversion of convertible debt, net of tax (shares) | shares		8,900,000
Stock Issued During Period, Shares, Conversion of Convertible Securities Due to Make-Whole Premium | shares		200,000
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | shares									8,600,000

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-Paragraph 2
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