Subsidiary Guarantors (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013
CONDENSED CONSOLIDATING BALANCE SHEET
Cash used in operating activities	$ 44,740	$ 34,066
Cash used in financing activities	(27,358)	(12,781)
US Subsidiaries [Member]
CONDENSED CONSOLIDATING BALANCE SHEET
Percentage of ownership in subsidiaries which jointly, severally, fully and unconditionally guarantee the senior notes	100.00%
Parent Company [Member]
CONDENSED CONSOLIDATING BALANCE SHEET
Cash used in operating activities	17,128	(13,564)
Cash used in financing activities	(5,327)	32,938
Guarantor Subsidiaries [Member]
CONDENSED CONSOLIDATING BALANCE SHEET
Cash used in operating activities	27,843	47,334
Cash used in financing activities	(22,192)	(43,365)
Non-Guarantor Subsidiaries [Member]
CONDENSED CONSOLIDATING BALANCE SHEET
Cash used in operating activities	(231)	296
Cash used in financing activities	$ 161	$ (2,354)

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

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- Definition

Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585

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- Definition

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Paragraph 28

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

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