CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
Balance, Stockholders Equity at Dec. 31, 2012	$ 454,233	$ 32	$ 450,792	$ (17,116)	$ 15	$ 18,617	$ 1,893
Balance (in shares) at Dec. 31, 2012		31,876,508
Issuance of stock - employee stock purchase plan	3,181	$ 0	3,181	0	0	0	0
Issuance of stock - employee stock purchase plan (in shares)		303,989
Issuance of stock - 401 (k) plan	8,581	$ 1	8,580	0	0	0	0
Issuance of stock - 401 (k) plan (in shares)		702,391
Exercise of stock options	261	$ 0	261	0	0	0	0
Exercise of stock options (in shares)		37,558
Issuance/(cancellation) of non-vested stock	0	$ 0	0	0	0	0	0
Issuance/(cancellation) of non-vested stock (in shares)		493,524
Non-cash compensation	6,519	$ 0	6,519	0	0	0	0
Tax deficit from stock options exercised and restricted stock vesting	(2,152)	0	(2,152)	0	0	0	0
Surrendered shares	(1,060)	0	0	(1,060)	0	0	0
Acquired noncontrolling interest	145	0	0	0	0	0	145
Noncontrolling interest distribution	(163)	0	0	0	0	0	(163)
Assets contributed to equity investment	709	0	709	0	0	0	0
Net (loss) income	(97,775)	0	0	0	0	(96,178)	(1,597)
Other comprehensive income (loss)	0
Balance, Stockholders Equity at Dec. 31, 2013	372,479	$ 33	467,890	(18,176)	15	(77,561)	278
Balance (in shares) at Dec. 31, 2013		33,413,970
Issuance of stock - employee stock purchase plan	2,433	$ 0	2,433	0	0	0	0
Issuance of stock - employee stock purchase plan (in shares)		176,796
Issuance of stock - 401 (k) plan	7,062	$ 1	7,061	0	0	0	0
Issuance of stock - 401 (k) plan (in shares)		430,919
Exercise of stock options	564	$ 0	564	0	0	0	0
Exercise of stock options (in shares)		28,229
Issuance/(cancellation) of non-vested stock	0	$ 1	(1)	0	0	0	0
Issuance/(cancellation) of non-vested stock (in shares)		519,612
Non-cash compensation	5,597	$ 0	5,597	0	0	0	0
Tax deficit from stock options exercised and restricted stock vesting	(579)	0	(579)	0	0	0	0
Surrendered shares	(1,684)	0	0	(1,684)	0	0	0
Acquired noncontrolling interest	0	0	0	0	0	0	0
Sale of noncontrolling interest	(1,549)	0	(493)	0	0	0	(1,056)
Decrease in noncontrolling interest	(350)	0	710	0	0	0	(1,060)
Net (loss) income	13,089	0	0	0	0	12,776	313
Other comprehensive income (loss)	0
Balance, Stockholders Equity at Dec. 31, 2014	397,762	$ 35	481,762	(19,860)	15	(64,785)	595
Balance (in shares) at Dec. 31, 2014		34,569,526
Issuance of stock - employee stock purchase plan	$ 2,204	$ 0	2,204	0	0	0	0
Issuance of stock - employee stock purchase plan (in shares)	2,977,712	79,323
Issuance of stock - 401 (k) plan	$ 6,032	$ 0	6,032	0	0	0	0
Issuance of stock - 401 (k) plan (in shares)		184,412
Exercise of stock options	399	$ 0	399	0	0	0	0
Exercise of stock options (in shares)		15,380
Issuance/(cancellation) of non-vested stock	0	$ 0	0	0	0	0	0
Issuance/(cancellation) of non-vested stock (in shares)		(61,675)
Non-cash compensation	11,824	$ 0	11,824	0	0	0	0
Tax benefit from stock options exercised and restricted stock vesting	2,073	0	2,073	0	0	0	0
Tax deficit from stock options exercised and restricted stock vesting	(4)	0	(4)	0	0	0	0
Surrendered shares	(2,525)	0	0	(2,525)	0	0	0
Shares repurchased	(4,581)	0	0	(4,581)	0	0	0
Noncontrolling interest distribution	(436)	0	0	0	0	0	(436)
Net (loss) income	(2,312)	0	0	0	0	(3,021)	709
Other comprehensive income (loss)	0
Balance, Stockholders Equity at Dec. 31, 2015	$ 410,436	$ 35	$ 504,290	$ (26,966)	$ 15	$ (67,806)	$ 868
Balance (in shares) at Dec. 31, 2015		34,786,966