Other Financial Information (Noncash Operating Working Capital) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Quarterly Information [Abstract]
Accounts receivable	$ 175,820	$ 224,281	$ (382,137)
Inventories	25,697us-gaap_IncreaseDecreaseInInventories	14,166us-gaap_IncreaseDecreaseInInventories	(94,907)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	6,575	195,013	(245,881)
Deferred income tax assets	6,884	15,510	(7,218)
Accounts payable and accrued liabilities	(54,785)	(176,543)	534,353
Current income tax liabilities	(163,920)	(6,098)	27,610
Net (increase) decrease in noncash operating working capital	$ (3,729)	$ 266,329	$ (168,180)

The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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- Definition

The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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- Definition

The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.

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- Definition

The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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- Definition

The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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- Definition

The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods.

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