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Guarantor Subsidiaries Financial Information Additional Information (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Cash and Cash Equivalents	$ 147,393	$ 327,420	$ 71,918	$ 21,862
Debt Instrument, Face Amount		1,000,000
Trade	275,431	332,574
Notes Receivable, Related Parties, Current	1,328	25,861
Other Receivables	390,484	243,973
Inventories	148,005	157,914
Deferred Income Taxes	137,716	211,303
Senior notes due April 2020 at 8.25%
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	1,250,000
Debt Instrument, Interest Rate, Stated Percentage	8.25%
Senior notes due March 2021 at 6.375%
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	250,000
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Senior Secured Notes Due April 2022 Par Value [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	$ 1,600,000
Debt Instrument, Interest Rate, Stated Percentage	5.875%