Condensed Combined Statements of Cash Flows (Predecessor, USD $) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES
Net income	$ 14,453	$ 8,897	$ 2,266
Results from discontinued operations		10	381
Income from continuing operations	14,453	8,907	2,647
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	12,806	11,601	11,708
Amortization of deferred leasing costs and in-place lease intangibles	2,092	1,308	1,286
Accrued straight-line rental revenue	(1,055)	(2,158)	(2,370)
Amortization of lease incentives and above or below-market rents	683	755	663
Accrued straight-line ground rent expense	364	333	312
Bad debt expense	162	305	140
Noncash stock compensation	1,249
Impairment charges	580
Noncash interest expense	636	615	896
Noncash loss on extinguishment of debt	644		1,083
Gain on acquisitions	(9,460)
Change in the fair value of derivatives	12	(408)	(436)
Income from real estate joint ventures	(210)	(261)	(309)
Loss on disposal of real estate assets			569
Changes in operating assets and liabilities, net of acquisitions:
Property assets	7,761	(991)	8,196
Property liabilities	(2,836)	2,404	(1,168)
Construction assets	(2,115)	2,170	7,694
Construction liabilities	(3,591)	(2,220)	(7,575)
Net cash provided by continuing operations	22,175	22,360	23,336
Net cash used for discontinued operations		(34)	(153)
Net cash provided by operating activities	22,175	22,326	23,183
INVESTING ACTIVITIES
Development of real estate investments	(41,298)	(2,665)	(3,576)
Tenant and building improvements	(3,920)	(2,307)	(3,801)
Acquisitions of real estate investments, net of cash acquired	(2,106)
Government development grants	300	400	750
Decrease in restricted cash	93	184	1,517
Contributions to real estate joint ventures	(81)
Return of capital from real estate joint ventures	511	405	580
Deferred leasing costs	(1,180)	(741)	(1,973)
Leasing incentives	(266)	(475)	(1,956)
Net cash used for continuing operations	(47,947)	(5,199)	(8,459)
Net cash provided by discontinued operations		497	2,461
Net cash used for investing activities	(47,947)	(4,702)	(5,998)
FINANCING ACTIVITIES
Proceeds from sale of common stock	203,245
Offering costs	(7,937)	(3,125)
Formation transactions	(47,450)
Debt issuances and credit facility borrowings	106,054	30,612	69,049
Debt and credit facility payments, including principal amortization	(197,478)	(35,093)	(63,698)
Debt issuance costs	(2,738)	(931)	(943)
Predecessor contributions	2,218	1,655	11,058
Predecessor distributions	(12,927)	(14,791)	(26,412)
Common stock dividends and common unit distributions	(7,733)
Net cash provided by (used for) continuing operations	35,254	(21,673)	(10,946)
Net cash used for discontinued operations			(1,225)
Net cash provided by (used for) financing activities	35,254	(21,673)	(12,171)
Net increase (decrease) in cash and cash equivalents	9,482	(4,049)	5,014
Cash and cash equivalents, beginning of period	9,400	13,449	8,435
Cash and cash equivalents, end of period	18,882	9,400	13,449
Supplemental cash flow information:
Cash paid for interest	12,617	16,161	17,366
Noncash contributions			59
(Decrease) increase in distributions payable	$ (528)	$ (297)	$ 825