CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands		Common Stock [Member]	Additional Paid-In Capital [Member]		Retained Earnings [Member]		Treasury Stock [Member]		Total Shareholders' Equity [Member]		Non-controlling Interests [Member]		Total
Beginning balance (As Reported [Member]) at Dec. 31, 2013		$ 143	$ 40,569		$ 119,206		$ (31,628)		$ 128,290		$ 22,727		$ 151,017
Beginning balance (Adjustment [Member])		0	13,970		(7,329)		0		6,641		(21,424)		(14,783)
Beginning balance at Dec. 31, 2013	[1]	$ 143	54,539		111,877		$ (31,628)		134,931		1,303		136,234
Beginning balance (in shares) (As Reported [Member]) at Dec. 31, 2013		14,316					(2,215)
Beginning balance (in shares) at Dec. 31, 2013	[1]	14,316					(2,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from exercise of stock options		$ 1	43		0		$ 0		44		0		44
Proceeds from exercise of stock options (in shares)		21					0
Net tax benefit from exercise of stock options		$ 0	948		0		$ 0		948		0		948
Issuance of restricted stock		$ 1	0		0		$ 0		1		0		1
Issuance of restricted stock (in shares)		150					0
Compensation expense - restricted stock/equity-based awards		$ 0	3,363		0		$ 0		3,363		0		3,363
Acquisitions and sales of non-controlling interests	[1]		(94)		0		0		(94)		(35)		(129)
Distributions to non-controlling interest partners	[1]	0	0		0		0		0		(5,963)		(5,963)
Dividends payable to USPT shareholders		0	0		(5,873)		0		(5,873)		0		(5,873)
Net income	[1]	0	0		19,131		0		19,131		6,183		25,314
Ending balance at Dec. 31, 2014	[1]	$ 145	58,799		125,135		$ (31,628)		152,451		1,488		153,939
Ending balance (in shares) at Dec. 31, 2014	[1]	14,487					(2,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from exercise of stock options		$ 1	4		0		$ 0		5		0		5
Proceeds from exercise of stock options (in shares)		1					0
Net tax benefit from exercise of stock options		$ 0	947		0		$ 0		947		0		947
Issuance of restricted stock		$ 0	0		0		$ 0		0		0		0
Issuance of restricted stock (in shares)		148					0
Compensation expense - restricted stock/equity-based awards		$ 0	4,491		0		$ 0		4,491		0		4,491
Transfer of compensation liability for certain stock issued pursuant to long-term incentive plans		0	446		0		0		446		0		446
Acquisitions and sales of non-controlling interests		0	(449)	[1]	0	[1]	0	[1]	(449)	[1]	(217)	[1]	(666)	[1]
Distributions to non-controlling interest partners		0	0		0		0		0	[1]	(5,892)	[1]	(5,892)	[1]
Dividends payable to USPT shareholders		0	0		(7,449)		0		(7,449)		0		(7,449)
Net income	[1]	0	0		20,615		0		20,615		5,874		26,489
Ending balance at Dec. 31, 2015	[1]	$ 146	64,238		138,301		$ (31,628)		171,057		1,253		172,310
Ending balance (in shares) at Dec. 31, 2015	[1]	14,636					(2,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock		$ 1	0		0		$ 0		1		0		1
Issuance of restricted stock (in shares)		97
Cancellation of restricted stock		$ 0	0		0		0		0		0		0
Compensation expense - restricted stock/equity-based awards		0	4,962		0		0		4,962		0		4,962
Transfer of compensation liability for certain stock issued pursuant to long-term incentive plans		0	211		0		0		211		0		211
Acquisitions and sales of non-controlling interests		0	(533)		0		0		(533)		(112)		(645)
Adjustment for prior year acquisitions of non-controlling interest - tax true up		0	(191)		0		0		(191)		0		(191)
Distributions to non-controlling interest partners		0	0		0		0		0		(5,718)		(5,718)
Dividends payable to USPT shareholders		0	0		(8,510)		0		(8,510)		0		(8,510)
Net income		0	0		20,551		0		20,551		5,717		26,268
Ending balance at Dec. 31, 2016		$ 147	$ 68,687		$ 150,342		$ (31,628)		$ 187,548		$ 1,140		$ 188,688
Ending balance (in shares) at Dec. 31, 2016		14,733					(2,215)

[1] as restated