Quarterly report pursuant to Section 13 or 15(d)

Supplemental Condensed Consolidating Balance Sheet (Parenthetical) (Details)

v2.4.0.6
Supplemental Condensed Consolidating Balance Sheet (Parenthetical) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Jan. 31, 2013
Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]      
Allowance for doubtful accounts $ 2,817   $ 2,668
Common stock, par value $ 0.01 $ 0.01 $ 10
Common stock, shares authorized 60,000,000   60,000,000,000
Common stock, shares issued 20,123,639   0
Preferred stock, par value $ 0.01   $ 0.01
Preferred stock, shares authorized 10,000,000   10,000,000
Preferred stock, shares issued 0   1,400,000
Common Class A [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Common stock, par value     $ 0.01
Common stock, shares authorized     60,000,000
Common stock, shares issued     0
Class B Common Stock [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Common stock, par value $ 0.01   $ 0.01
Common stock, shares authorized 60,000,000   60,000,000
Common stock, shares issued 0   24,500,000
Series A Preferred Stock [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Preferred stock, par value     $ 0.01
Preferred stock, shares authorized     10,000,000
Preferred stock, shares issued     1,400,000
Series B Preferred Stock [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Preferred stock, par value     $ 0.01
Preferred stock, shares authorized     10,000,000
Preferred stock, shares issued     0