Derivatives (Textual) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended			3 Months Ended					3 Months Ended				3 Months Ended				3 Months Ended
	Sep. 30, 2014 Interest Rate Cash Flow Hedges	Sep. 30, 2013 Interest Rate Cash Flow Hedges	Jun. 30, 2011 Interest Rate Cash Flow Hedges agreement	Dec. 31, 2013 Interest rate cap	Mar. 31, 2010 Interest rate cap Interest Rate Cash Flow Hedges agreement	Mar. 31, 2010 Interest rate cap Interest Rate Cash Flow Hedges LIBOR	Jun. 30, 2011 USR Swap one Interest Rate Cash Flow Hedges	Sep. 30, 2014 USR Swap one Interest Rate Cash Flow Hedges	Jun. 30, 2011 USR Swap one Interest Rate Cash Flow Hedges LIBOR	Jun. 30, 2011 USR Swap two Interest Rate Cash Flow Hedges	Sep. 30, 2014 Interest Rate Swap, Maturing December 2017	Dec. 31, 2013 Interest Rate Swap, Maturing December 2017	Dec. 31, 2012 Interest Rate Swap, Maturing December 2017 LIBOR	Dec. 31, 2013 Interest Rate Swap, Maturing December 2017 LIBOR	Sep. 30, 2014 Interest Rate Swap, Matures April 2018	Sep. 30, 2013 Interest Rate Swap, Matures April 2018	Sep. 30, 2013 Interest Rate Swap, Matures April 2018 LIBOR
Derivative [Line Items]
Variable bank rate debt	$ 257,769	$ 163,346
Variable rate debt as a percent of total debt (percent)	51.00%	29.90%
Expected reclassification from accumulated other comprehensive loss to interest expense and other, net	52
Number of agreements			2		3
Derivative variable rate basis						LIBOR			one-month LIBOR				one-month LIBOR				one-month LIBOR
Maturity					Feb. 01, 2014		Oct. 01, 2015			Apr. 01, 2014
Derivative, notional amount				250,000	150,000			1,133			3,486				3,150
Paid for cap purchase amortized as interest expense				$ 815
Fixed rate of interest paid by the Company (percent)							5.71%					3.75%				2.873%
Recorded interest expense rate (percent)							8.71%					3.75%				2.873%
Underlying debt interest rate (percent)							3.00%
Interest rate agreement, basis spread on variable rate (percent)				2.50%								2.50%		2.50%		2.00%	2.00%