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Consolidated Statements of Changes in Stockholders' Equity - USD ($) | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | Treasury Stock [Member] | Total Attributed To Shareholders [Member] | Non-controlling Interest [Member] | Redeemable Non-controlling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2012 |  | 7,826,674 |  |  |  | 245,000 |  |  |
Beginning Balance at Dec. 31, 2012 | $ 244,471,000 | $ 81,000 | $ 942,825,000 | $ (680,411,000) | $ (287,000) | $ (17,734,000) | $ 244,474,000 | $ (3,000) | $ 3,163,000
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) | 75,131,000 |  |  | 75,190,000 |  |  | 75,190,000 | (59,000) | 1,999,000
Net unrealized loss on securities available-for-sale | 56,000 |  |  |  | 56,000 |  | 56,000 |  |
Foreign currency translation adjustment | 81,000 |  |  |  | 81,000 |  | 81,000 |  |
Activity of noncontrolling interests, net | 1,477,000 |  |  |  |  |  |  |  | 37,024,000
Issuance of common stock, net | 191,578,000 | $ 13,000 | 191,565,000 |  |  |  | 191,578,000 |  |
Issuance of common stock, net (in shares) |  | 1,298,386 |  |  |  |  |  |  |
Cash dividends declared | 0 |  |  |  |  |  |  |  |
Repurchase of common shares | (19,704,000) |  |  |  |  | $ (19,704,000) | (19,704,000) |  |
Repurchase of common shares (in shares) |  | 105,000 |  |  |  | 105,000 |  |  |
Issuance of common stock related to employee stock transactions | 633,000 | $ 1,000 | 632,000 |  |  |  | 633,000 |  |
Issuance of common stock related to employee stock transactions (in shares) |  | 85,461 |  |  |  |  |  |  |
Taxes paid on stock-based compensation | (7,513,000) |  | (7,513,000) |  |  |  | (7,513,000) |  |
Stock-based compensation | 7,657,000 |  | 7,657,000 |  |  |  | 7,657,000 |  |
Excess tax benefits from stock-based compensation | 478,000 |  | 478,000 |  |  |  | 478,000 |  |
Ending Balance (in shares) at Dec. 31, 2013 |  | 9,105,521 |  |  |  | 350,000 |  |  |
Ending Balance at Dec. 31, 2013 | 492,868,000 | $ 95,000 | 1,135,644,000 | (605,221,000) | (150,000) | $ (37,438,000) | 492,930,000 | (62,000) | 42,186,000
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) | 97,572,000 |  |  | 97,700,000 |  |  | 97,700,000 | (128,000) | (607,000)
Net unrealized loss on securities available-for-sale | 124,000 |  |  |  | 124,000 |  | 124,000 |  |
Foreign currency translation adjustment | (216,000) |  |  |  | (216,000) |  | (216,000) |  |
Activity of noncontrolling interests, net | (47,165,000) |  |  |  |  |  |  |  | (18,508,000)
Cash dividends declared | (12,451,000) |  | (12,451,000) |  |  |  | (12,451,000) |  |
Repurchase of common shares | $ (40,261,000) |  |  |  |  | $ (40,261,000) | (40,261,000) |  |
Repurchase of common shares (in shares) | 225,441 | 225,441 |  |  |  | 225,441 |  |  |
Issuance of common stock related to employee stock transactions | $ 1,417,000 | $ 1,000 | 1,416,000 |  |  |  | 1,417,000 |  |
Issuance of common stock related to employee stock transactions (in shares) |  | 95,753 |  |  |  |  |  |  |
Taxes paid on stock-based compensation | (9,512,000) |  | (9,512,000) |  |  |  | (9,512,000) |  |
Stock-based compensation | 9,006,000 |  | 9,006,000 |  |  |  | 9,006,000 |  |
Excess tax benefits from stock-based compensation | 24,805,000 |  | 24,805,000 |  |  |  | 24,805,000 |  |
Ending Balance (in shares) at Dec. 31, 2014 |  | 8,975,833 |  |  |  | 575,441 |  |  |
Ending Balance at Dec. 31, 2014 | 563,352,000 | $ 96,000 | 1,148,908,000 | (507,521,000) | (242,000) | $ (77,699,000) | 563,542,000 | (190,000) | 23,071,000
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) | 34,930,000 |  |  | 35,106,000 |  |  | 35,106,000 | (176,000) | (4,259,000)
Net unrealized loss on securities available-for-sale | (358,000) |  |  |  | (358,000) |  | (358,000) |  |
Foreign currency translation adjustment | (434,000) |  |  |  | (434,000) |  | (434,000) |  |
Activity of noncontrolling interests, net | (648,000) |  |  | (199,000) |  |  | (199,000) | 199,000 | 55,052,000
Cash dividends declared | (16,009,000) |  | (16,009,000) |  |  |  | (16,009,000) |  |
Repurchase of common shares | $ (80,000,000) |  |  |  |  | $ (80,000,000) | (80,000,000) |  |
Repurchase of common shares (in shares) | 638,703 | 638,703 |  |  |  | 638,703 |  |  |
Issuance of common stock related to employee stock transactions | $ 842,000 |  | 842,000 |  |  |  | 842,000 |  |
Issuance of common stock related to employee stock transactions (in shares) |  | 61,814 |  |  |  |  |  |  |
Taxes paid on stock-based compensation | (5,080,000) |  | (5,080,000) |  |  |  | (5,080,000) |  |
Stock-based compensation | 11,116,000 |  | 11,116,000 |  |  |  | 11,116,000 |  |
Excess tax benefits from stock-based compensation | 1,098,000 |  | 1,098,000 |  |  |  | 1,098,000 |  |
Ending Balance (in shares) at Dec. 31, 2015 |  | 8,398,944 |  |  |  | 1,214,144 |  |  |
Ending Balance at Dec. 31, 2015 | $ 509,457,000 | $ 96,000 | $ 1,140,875,000 | $ (472,614,000) | $ (1,034,000) | $ (157,699,000) | $ 509,624,000 | $ (167,000) | $ 73,864,000

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