Derivative Financial Instruments - Table of Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Derivative
Fair value, liability	$ (5,053)		$ (9,370)
Fair value, asset	5,073		0
Interest Rate Swap | 3.79%
Derivative
Notional Amount			17,304	[1]
Index			LIBOR	[1]
Rate			3.79%	[1]
Fair value, liability			(459)	[1]
Interest Rate Swap | 1.07%
Derivative
Notional Amount			75,000	[1]
Index			LIBOR	[1]
Rate			1.07%	[1]
Fair value, liability			(659)	[1]
Interest Rate Swap | 1.23%
Derivative
Notional Amount	200,000		200,000
Index	LIBOR		LIBOR
Rate	1.23%		1.23%
Fair value, liability	(2,078)		(5,180)
Interest Rate Swap | 0.86%
Derivative
Notional Amount	100,000		100,000
Index	LIBOR		LIBOR
Rate	0.86%		0.86%
Fair value, liability	(729)		(1,310)
Interest Rate Swap | 1.39%
Derivative
Notional Amount	50,000		50,000
Index	LIBOR		LIBOR
Rate	1.39%		1.39%
Fair value, liability			(909)
Fair value, asset	1,350
Interest Rate Swap | 1.24%
Derivative
Notional Amount	105,000		105,000
Index	LIBOR		LIBOR
Rate	1.24%		1.24%
Fair value, liability			(853)
Fair value, asset	3,723
Interest Rate Swap | 4.98%
Derivative
Notional Amount	27,618	[2]
Index	LIBOR	[2]
Rate	4.98%	[2]
Fair value, liability	$ (2,246)	[2]

[1] We terminated the interest rate swaps in March 2013.

[2] We assumed the interest rate swap in December 2013 as part of an acquisition, see Note 3.