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Long-Term Debt (Narrative) (Details) (USD $)
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0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 0 Months Ended | 9 Months Ended | ||||||||||||||||||
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Apr. 14, 2014
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
YTD [Member]
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Apr. 14, 2014
Term Number One [Member]
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Apr. 14, 2014
Term Number Two [Member]
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Sep. 30, 2014
Term Number Two [Member]
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Apr. 14, 2014
Term Number Three [Member]
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Sep. 30, 2014
Minimum [Member]
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Sep. 30, 2014
Maximum [Member]
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Sep. 30, 2014
Prime Rate [Member]
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Sep. 30, 2014
Libor [Member]
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Sep. 30, 2014
Ratio Maximum Per Covenant [Member]
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Apr. 14, 2014
Ratio Maximum Per Covenant [Member]
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Sep. 30, 2014
Ratio Minimum Per Covenant [Member]
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Sep. 30, 2014
Ratio Actual [Member]
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Sep. 30, 2014
Revolving Credit Facility [Member]
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Apr. 14, 2014
Revolving Credit Facility [Member]
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Apr. 13, 2014
Revolving Credit Facility [Member]
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Sep. 30, 2014
Revolving Credit Facility [Member]
QTD [Member]
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Feb. 27, 2014
Revolving Credit Facility [Member]
Senior Unsecured Debt [Member]
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Sep. 30, 2014
Term Loan
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| Debt Covenant To Actual Ratios [Line Items] | ||||||||||||||||||||||||
| Revolving credit facility, maximum borrowing capacity | $ 325,000,000 | $ 325,000,000 | $ 200,000,000 | $ 200,000,000 | $ 125,000,000 | $ 150,000,000 | $ 125,000,000 | |||||||||||||||||
| Term loan facility | 125,000,000 | |||||||||||||||||||||||
| Revolving credit facility present accordion provisions | 50,000,000 | 50,000,000 | ||||||||||||||||||||||
| Credit facility maturity date (Date) | Mar. 31, 2019 | |||||||||||||||||||||||
| Amount drawn under term loan facility | 42,300,000 | 122,700,000 | ||||||||||||||||||||||
| Description of variable interest rate | prime rate | LIBOR | ||||||||||||||||||||||
| Basis spread on variable rate | 1.50% | 2.50% | ||||||||||||||||||||||
| Weighted average interest rate | 2.80% | 2.90% | ||||||||||||||||||||||
| (Decrease) in variable interest rate of debt instrument | 0.50% | |||||||||||||||||||||||
| Assets and operations independent of subsidiaries | 0 | 0 | ||||||||||||||||||||||
| Ratio of indebtedness to net capital (in Ratio) | 3.50 | 3.5 | 3.75 | 3.75 | 2.83 | |||||||||||||||||||
| Gains Losses On Extinguishment Of Debt And Other Costs | $ 0 | $ 0 | $ 1,042,000 | $ 0 | ||||||||||||||||||||
| Ratio of earnings to fixed cost obligations (in Ratio) | 1.2 | 2.60 | ||||||||||||||||||||||
| Deferred purchase price notes payable to sellers of acquired entities, discounted imputed interest rate (in Percent) | 7.00% | 11.00% | ||||||||||||||||||||||
| Deferred purchase price note interest rate | 0.00% | 0.00% | ||||||||||||||||||||||
| Imputed interest rate | 9.50% | 11.00% | ||||||||||||||||||||||
| Deferred purchase price notes payable to sellers of acquired entities, range of original maturities (in years) | 5 years | 20 years | ||||||||||||||||||||||
| Debt Instrument, Periodic Principal Repayment, Percentage | 7.50% | 10.00% | 12.50% | |||||||||||||||||||||
| Debt Instrument, Periodic Principal Payments, Term | 2 years | |||||||||||||||||||||||