Fair Values (Details 2) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Jun. 30, 2013 Net Carrying Value	Dec. 31, 2012 Net Carrying Value	Jun. 30, 2013 Estimated Fair Value	Dec. 31, 2012 Estimated Fair Value
Financial liabilities:
Debt		$ 67,968	$ 68,007	$ 68,566	$ 68,631
Fair value measurement loss	$ (500)

Impairment recognized during the period and allocated to the reportable segment that results from the write-down of indefinite-lived intangible assets after comparing the implied fair value of reporting unit indefinite-lived intangible assets with the carrying amount of that indefinite-lived intangible assets, which are assessed at least annually for impairment.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b),(d)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16373-109275

Name:	us-gaap_IndefiniteLivedIntangibleAssetsImpairmentLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration