CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Balance, Stockholders Equity	$ 397,762	$ 372,479	$ 454,233	$ 520,148
Issuance of stock - employee stock purchase plan	2,433	3,181	3,913
Issuance of stock - employee stock purchase plan (in shares)	2,899,528
Issuance of stock - 401 (k) plan	7,062	8,581	9,324
Exercise of stock options	564	261	156
Issuance of non-vested stock	0	0	0
Non-cash compensation	5,597	6,519	7,217
Tax deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	(579)	(2,152)	(3,045)
Surrendered shares	(1,684)	(1,060)	(1,346)
Acquired/Sale of noncontrolling interest	(1,549)	145	15,931
Noncontrolling interest distribution		(163)	(323)
Decrease in noncontrolling interest	350
Assets contributed to equity method investment		709	839
Net income (loss)	13,089	(97,775)	(98,583)
Unrealized gain (loss) on deferred compensation plan assets	0	0	2
Common Stock [Member]
Balance, Stockholders Equity	35	33	32	30
Balance (in shares)	34,569,526	33,413,970	31,876,508	30,328,549
Issuance of stock - employee stock purchase plan	0	0	0
Issuance of stock - employee stock purchase plan (in shares)	176,796	303,989	360,114
Issuance of stock - 401 (k) plan	1	1	1
Issuance of stock - 401 (k) plan (in shares)	430,919	702,391	729,915
Exercise of stock options	0	0	0
Exercise of stock options (in shares)	28,229	37,558	22,119
Issuance of non-vested stock	1	0	1
Issuance of non-vested stock (in shares)	519,612	493,524	435,811
Non-cash compensation	0	0	0
Tax deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	0	0	0
Surrendered shares	0	0	0
Acquired/Sale of noncontrolling interest	0	0	0
Noncontrolling interest distribution		0	0
Decrease in noncontrolling interest	0
Assets contributed to equity method investment		0	0
Net income (loss)	0	0	0
Unrealized gain (loss) on deferred compensation plan assets			0
Additional Paid-in Capital [Member]
Balance, Stockholders Equity	481,762	467,890	450,792	432,390
Issuance of stock - employee stock purchase plan	2,433	3,181	3,913
Issuance of stock - 401 (k) plan	7,061	8,580	9,323
Exercise of stock options	564	261	156
Issuance of non-vested stock	(1)	0	(1)
Non-cash compensation	5,597	6,519	7,217
Tax deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	(579)	(2,152)	(3,045)
Surrendered shares	0	0	0
Acquired/Sale of noncontrolling interest	(493)	0	0
Noncontrolling interest distribution		0	0
Decrease in noncontrolling interest	(710)
Assets contributed to equity method investment		709	839
Net income (loss)	0	0	0
Unrealized gain (loss) on deferred compensation plan assets			0
Treasury Stock [Member]
Balance, Stockholders Equity	(19,860)	(18,176)	(17,116)	(15,770)
Issuance of stock - employee stock purchase plan	0	0	0
Issuance of stock - 401 (k) plan	0	0	0
Exercise of stock options	0	0	0
Issuance of non-vested stock	0	0	0
Non-cash compensation	0	0	0
Tax deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	0	0	0
Surrendered shares	(1,684)	(1,060)	(1,346)
Acquired/Sale of noncontrolling interest	0	0	0
Noncontrolling interest distribution		0	0
Decrease in noncontrolling interest	0
Assets contributed to equity method investment		0	0
Net income (loss)	0	0	0
Unrealized gain (loss) on deferred compensation plan assets			0
Accumulated Other Comprehensive Income (Loss) [Member]
Balance, Stockholders Equity	15	15	15	13
Issuance of stock - employee stock purchase plan	0	0	0
Issuance of stock - 401 (k) plan	0	0	0
Exercise of stock options	0	0	0
Issuance of non-vested stock	0	0	0
Non-cash compensation	0	0	0
Tax deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	0	0	0
Surrendered shares	0	0	0
Acquired/Sale of noncontrolling interest	0	0	0
Noncontrolling interest distribution		0	0
Decrease in noncontrolling interest	0
Assets contributed to equity method investment		0	0
Net income (loss)	0	0	0
Unrealized gain (loss) on deferred compensation plan assets			2
Retained Earnings [Member]
Balance, Stockholders Equity	(64,785)	(77,561)	18,617	102,205
Issuance of stock - employee stock purchase plan	0	0	0
Issuance of stock - 401 (k) plan	0	0	0
Exercise of stock options	0	0	0
Issuance of non-vested stock	0	0	0
Non-cash compensation	0	0	0
Tax deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	0	0	0
Surrendered shares	0	0	0
Acquired/Sale of noncontrolling interest	0	0	0
Noncontrolling interest distribution		0	0
Decrease in noncontrolling interest	0
Assets contributed to equity method investment		0	0
Net income (loss)	12,776	(96,178)	(83,588)
Unrealized gain (loss) on deferred compensation plan assets			0
Noncontrolling Interest [Member]
Balance, Stockholders Equity	595	278	1,893	1,280
Issuance of stock - employee stock purchase plan	0	0	0
Issuance of stock - 401 (k) plan	0	0	0
Exercise of stock options	0	0	0
Issuance of non-vested stock	0	0	0
Non-cash compensation	0	0	0
Tax deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	0	0	0
Surrendered shares	0	0	0
Acquired/Sale of noncontrolling interest	(1,056)	145	15,931
Noncontrolling interest distribution		(163)	(323)
Decrease in noncontrolling interest	1,060
Assets contributed to equity method investment		0	0
Net income (loss)	313	(1,597)	(14,995)
Unrealized gain (loss) on deferred compensation plan assets			$ 0