Other Income (Expense), net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Income and Expenses [Abstract]
Investment income	$ 6,621us-gaap_InvestmentIncomeNet	$ 4,804us-gaap_InvestmentIncomeNet	$ 1,903us-gaap_InvestmentIncomeNet
Realized gain on sale of marketable securities, net	3,765	2,608	282
Realized loss on financial instrument obligation	(1,821)	0	0
Realized loss upon change to equity method at fair value	(568)	0	0
Foreign exchange loss	(1,059)	0	0
Gain (loss) on sale of property and equipment	191	132	(819)
Loss on extinguishment of debt	0	(463)	0
Other	(71)sxcl_OtherIncomeExpense	(7)sxcl_OtherIncomeExpense	(299)sxcl_OtherIncomeExpense
Other income (expense), net	$ 7,058us-gaap_OtherNonoperatingIncomeExpense	$ 7,074us-gaap_OtherNonoperatingIncomeExpense	$ 1,067us-gaap_OtherNonoperatingIncomeExpense

Loss on financial instrument obligations

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- Definition

Marketable Securities, Realized Gain (Loss) Upon Change to Equity Method at Fair Value

+ References

No definition available.

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- Definition

Other Income (Expense)

+ References

No definition available.

+ Details

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- Definition

Amount before tax of foreign currency transaction realized and unrealized loss recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

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-Topic 830

-SubTopic 20

-Section 45

-Paragraph 2

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

+ Details

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

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- Definition

Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

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- Definition

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (a)

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- Definition

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5

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