Debt (Details 1) (USD $)	3 Months Ended															3 Months Ended		3 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	Nov. 08, 2012	Mar. 31, 2013 Revolving Credit Facility [Member]	Dec. 31, 2012 Revolving Credit Facility [Member]	Mar. 31, 2013 Subordinated Notes [Member]	Mar. 26, 2013 Subordinated Notes [Member]	Dec. 31, 2012 Subordinated Notes [Member]	Mar. 31, 2013 Loans Payable [Member] Senior Notes [Member]	Dec. 31, 2012 Loans Payable [Member] Senior Notes [Member]	Nov. 08, 2012 Loans Payable [Member] Senior Notes [Member]	Mar. 31, 2013 Loans Payable [Member] Revolving Credit Facility [Member]	Nov. 08, 2012 Line of Credit [Member] Revolving Credit Facility [Member]	Mar. 31, 2013 London Interbank Offered Rate (LIBOR) [Member] Senior Notes [Member]	Nov. 08, 2012 London Interbank Offered Rate (LIBOR) [Member] Senior Notes [Member]	Mar. 31, 2013 U.S. Base Rate [Member] Senior Notes [Member]	Nov. 08, 2012 U.S. Base Rate [Member] Senior Notes [Member]	Dec. 31, 2012 Interest Rate Swap [Member]
Debt Instrument [Line Items]
senior secured credit facility					$ 205,000,000
Line of Credit Facility, Maximum Borrowing Capacity															90,000,000
Long-term Debt	146,897,000			137,750,000		22,000,000	0	0		9,440,000	112,844,000	115,000,000
Current portion of long-term debt	8,943,000			8,943,000									2,200,000
Long-term Debt, Maturities, Repayments of Principal in Year Two													3,600,000
Long-term Debt, Maturities, Repayments of Principal in Year Three													4,300,000
Long-term Debt, Maturities, Repayments of Principal in Year Four													4,300,000
Long-term Debt, Maturities, Repayments of Principal in Year Five													4,300,000
Debt Instrument, Description of Variable Rate Basis																LIBOR		Base Rate
Debt instrument, basis spread on variable rate (as a percent)																	2.75%		1.75%
Debt Instrument, Maturity Date	Nov. 08, 2017
Debt, Weighted Average Interest Rate (as a percent)											2.96%			5.00%
Derivative, Fixed Interest Rate (as a percent)																				0.569%
Derivative, Notional Amount																				56,400,000
Derivative, Notional Amount, Next Twelve Months																				1,100,000
Derivative, Notional Amount, Year Two																				1,800,000
Derivative, Notional Amount, Year Three																				2,200,000
Debt Instrument, Repurchase Amount									31,800,000
Debt instrument, interest rate, stated percentage (as a percent)								10.00%	10.00%
Debt Instrument, Redemption Amount as Percentage of Principal Amount (as a percent)									112.60%
Debt Instrument, Irrevocable Deposit									36,900,000
Loss on early retirement of debt	$ 5,662,000	$ (5,700,000)	$ 0