Derivatives - Textual (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Dec. 31, 2013 USD ($) agreement	Jun. 30, 2011 agreement	Mar. 31, 2010 USD ($) agreement	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014	Mar. 31, 2013	Dec. 31, 2012
Interest Rate Cash Flow Hedges
Derivative [Line Items]
Variable bank rate debt				$ 257,075	$ 258,500
Variable rate debt as a percent of total debt (percent)				47.30%	50.90%
Expected reclassification from accumulated other comprehensive loss to interest expense and other, net				$ 351
Interest rate cap
Derivative [Line Items]
Derivative, notional amount	$ 250,000
Paid for cap purchase amortized as interest expense	$ 815
Interest rate agreement, basis spread on variable rate (percent)	2.50%
Interest rate cap | Interest Rate Cash Flow Hedges
Derivative [Line Items]
Number of agreements | agreement	5		3
Maturity			Feb. 01, 2014
Derivative, notional amount			$ 150,000
USR Swap one | Interest Rate Cash Flow Hedges
Derivative [Line Items]
Maturity		Oct. 01, 2015
Derivative, notional amount				349
Fixed rate of interest paid by the Company (percent)		5.71%
Recorded interest expense rate (percent)		8.71%
Underlying debt interest rate (percent)		3.00%
USR Swap two | Interest Rate Cash Flow Hedges
Derivative [Line Items]
Maturity		Apr. 01, 2014
Interest Rate Swap, Maturing December 2017
Derivative [Line Items]
Derivative, notional amount				2,717
Fixed rate of interest paid by the Company (percent)								3.75%
Recorded interest expense rate (percent)								3.75%
Interest rate agreement, basis spread on variable rate (percent)								2.50%
Interest Rate Swap, Maturing December 2017 | LIBOR
Derivative [Line Items]
Interest rate agreement, basis spread on variable rate (percent)								2.50%
Interest Rate Swap, Matures April 2018
Derivative [Line Items]
Derivative, notional amount				2,491
Fixed rate of interest paid by the Company (percent)							2.873%
Recorded interest expense rate (percent)							2.873%
Interest rate agreement, basis spread on variable rate (percent)							2.00%
Interest Rate Swap, Matures April 2018 | LIBOR
Derivative [Line Items]
Interest rate agreement, basis spread on variable rate (percent)							2.00%
Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount				$ 1,519
Interest rate agreement, basis spread on variable rate (percent)						1.34%
Interest Rate Swap | Interest Rate Cash Flow Hedges
Derivative [Line Items]
Number of agreements | agreement		2