Fair Value of Financial Instruments (Details 2) (Level 1, 7.75% Senior Notes due 2019, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Carrying Amount
Fair Value of Other Financial Instruments
Long term debt	$ 349,585	$ 349,535
Estimated Fair Value
Fair Value of Other Financial Instruments
Long term debt	$ 348,700	$ 334,300

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

No definition available.

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