CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance, Stockholders Equity	$ 372,479	$ 454,233	$ 520,148	$ 879,715
Issuance of stock - employee stock purchase plan	3,181	3,913	5,149
Issuance of stock - employee stock purchase plan (in shares)	2,755,337
Issuance of stock - 401 (k) plan	8,581	9,324	12,002
Exercise of stock options	261	156	245
Issuance of non-vested stock	0	0	0
Non-cash compensation	6,519	7,217	8,292
Tax deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	(2,152)	(3,045)	(453)
Surrendered shares	(1,060)	(1,346)	(1,748)
Acquired noncontrolling interest	145	15,931	0
Noncontrolling interest distribution	(163)	(323)	(700)
Assets contributed to equity method investment	709	839
Net income (loss)	(97,775)	(98,583)	(382,342)
Unrealized gain (loss) on deferred compensation plan assets	0	2	(12)
Common Stock [Member]
Balance, Stockholders Equity	33	32	30	29
Balance (in shares)	33,413,970	31,876,508	30,328,549	29,232,807
Issuance of stock - employee stock purchase plan	0	0	0
Issuance of stock - employee stock purchase plan (in shares)	303,989	360,114	242,789
Issuance of stock - 401 (k) plan	1	1	1
Issuance of stock - 401 (k) plan (in shares)	702,391	729,915	475,715
Exercise of stock options	0	0	0
Exercise of stock options (in shares)	37,558	22,119	7,336
Issuance of non-vested stock	0	1	0
Issuance of non-vested stock (in shares)	493,524	435,811	369,902
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 noncontrolling interest	0	0
Noncontrolling interest distribution	0	0	0
Assets contributed to equity method investment	0	0
Net income (loss)	0	0	0
Unrealized gain (loss) on deferred compensation plan assets		0	0
Additional Paid-in Capital [Member]
Balance, Stockholders Equity	467,890	450,792	432,390	407,156
Issuance of stock - employee stock purchase plan	3,181	3,913	5,149
Issuance of stock - 401 (k) plan	8,580	9,323	12,001
Exercise of stock options	261	156	245
Issuance of non-vested stock	0	(1)	0
Non-cash compensation	6,519	7,217	8,292
Tax deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	(2,152)	(3,045)	(453)
Surrendered shares	0	0	0
Acquired noncontrolling interest	0	0
Noncontrolling interest distribution	0	0	0
Assets contributed to equity method investment	709	839
Net income (loss)	0	0	0
Unrealized gain (loss) on deferred compensation plan assets		0	0
Treasury Stock [Member]
Balance, Stockholders Equity	(18,176)	(17,116)	(15,770)	(14,022)
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	(1,060)	(1,346)	(1,748)
Acquired noncontrolling interest	0	0
Noncontrolling interest distribution	0	0	0
Assets contributed to equity method investment	0	0
Net income (loss)	0	0	0
Unrealized gain (loss) on deferred compensation plan assets		0	0
Accumulated Other Comprehensive Income (Loss) [Member]
Balance, Stockholders Equity	15	15	13	25
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 noncontrolling interest	0	0
Noncontrolling interest distribution	0	0	0
Assets contributed to equity method investment	0	0
Net income (loss)	0	0	0
Unrealized gain (loss) on deferred compensation plan assets		2	(12)
Retained Earnings [Member]
Balance, Stockholders Equity	(77,561)	18,617	102,205	484,669
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 noncontrolling interest	0	0
Noncontrolling interest distribution	0	0	0
Assets contributed to equity method investment	0	0
Net income (loss)	(96,178)	(83,588)	(382,464)
Unrealized gain (loss) on deferred compensation plan assets		0	0
Noncontrolling Interest [Member]
Balance, Stockholders Equity	278	1,893	1,280	1,858
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 noncontrolling interest	145	15,931
Noncontrolling interest distribution	(163)	(323)	(700)
Assets contributed to equity method investment	0	0
Net income (loss)	(1,597)	(14,995)	122
Unrealized gain (loss) on deferred compensation plan assets		$ 0	$ 0