Commitments and Contingencies (Details) (Central Merger, USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Commitments and contingencies
Structural or other improvement and repair costs incurred	$ 242	$ 1,184
Expected recovery through applicable indemnity of cost incurred expressed as percentage of total cost	80.00%
Minimum
Commitments and contingencies
Estimated total structural and other improvement and repair costs related to lease contracts acquired in the Central Merger		5,000
Maximum
Commitments and contingencies
Estimated total structural and other improvement and repair costs related to lease contracts acquired in the Central Merger		$ 20,000