Credit Agreement, Long-Term Debt (Interest Rate Margins) (Details)	Mar. 31, 2013
Level 1 | LIBOR | Term loan
Debt Instrument [Line Items]
Interest Rate Margins (percent)	2.75%
Level 1 | LIBOR | Revolving credit facility
Debt Instrument [Line Items]
Interest Rate Margins (percent)	2.00%
Level 1 | LIBOR | Draw-to term loan
Debt Instrument [Line Items]
Interest Rate Margins (percent)	2.75%
Level 1 | Maximum
Debt Instrument [Line Items]
Ratio of Indebtedness to EBITDA	0.75
Level 2 | LIBOR | Term loan
Debt Instrument [Line Items]
Interest Rate Margins (percent)	3.25%
Level 2 | LIBOR | Revolving credit facility
Debt Instrument [Line Items]
Interest Rate Margins (percent)	2.50%
Level 2 | LIBOR | Draw-to term loan
Debt Instrument [Line Items]
Interest Rate Margins (percent)	3.25%
Level 2 | Minimum
Debt Instrument [Line Items]
Ratio of Indebtedness to EBITDA	0.75