Debt (Details 3) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Summary of deferred financing costs
Beginning balance	$ 30,146
Amortization of deferred financing costs	(2,553)
Write-off of deferred financing costs	(14)
Ending balance	27,579
Second lien notes [Member]
Summary of deferred financing costs
Beginning balance	16,649
Amortization of deferred financing costs	(1,299)
Ending balance	15,350
2011 Credit Agreement [Member] | Senior secured credit facility [Member]
Summary of deferred financing costs
Beginning balance	6,882
Amortization of deferred financing costs	(586)
Ending balance	6,296
2011 Credit Agreement [Member] | Senior secured incremental term [Member]
Summary of deferred financing costs
Beginning balance	3,092
Amortization of deferred financing costs	(266)
Write-off of deferred financing costs	(14)
Ending balance	2,812
2011 Credit Agreement [Member] | Senior revolving credit facility [Member]
Summary of deferred financing costs
Beginning balance	3,523
Amortization of deferred financing costs	(402)
Ending balance	$ 3,121