Schedule II - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Allowance for Doubtful Accounts [Member]
Allowance for doubtful accounts		$ 1,667	$ 730		$ 2,064
Allowance for doubtful accounts		$ 606	1,356		$ 432
Allowance for doubtful accounts			290	[1]
Allowance for doubtful accounts	[2]	$ (479)	(709)		$ (1,766)
Allowance for doubtful accounts		1,794	1,667		730
Valuation Allowance of Deferred Tax Assets [Member]
Allowance for doubtful accounts		$ 2,052	2,748		3,157
Allowance for doubtful accounts			$ 3		$ 92
Allowance for doubtful accounts
Allowance for doubtful accounts	[2]	$ (369)	$ (699)		$ (501)
Allowance for doubtful accounts		$ 1,683	$ 2,052		$ 2,748

[1] In 2014, the change in the allowance for doubtful accounts represents the fair value of balances assumed in acquisition transactions. See Note 2 “Acquisitions and Dispositions” for further information.

[2] Deductions from allowance for doubtful accounts represent write-offs of receivable balances not considered collectible. The deduction from the valuation allowance for deferred tax assets represents changes in estimates of our future taxable income and our estimated future usage of certain net operating loss carryforwards, as well as expiration of certain net operating loss carryforwards.