Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Name:	us-gaap_SeniorNotes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Supplemental Guarantors Consolidating Condensed Financial Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 U.S. Subsidiaries [Member]	Mar. 31, 2013 9.75% Senior Notes [Member]	Dec. 31, 2012 9.75% Senior Notes [Member]	Feb. 14, 2007 9.75% Senior Notes [Member]	Mar. 31, 2013 9½% Senior Notes [Member]	Mar. 20, 2013 9½% Senior Notes [Member]	Dec. 31, 2012 9½% Senior Notes [Member]
Interest rate of senior notes						9.75%		9.50%
Principal amount	$ 250,000	$ 275,000		$ 0	$ 275,000		$ 250,000	$ 250,000	$ 0
Ownership percentage			100.00%