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QUARTERLY FINANCIAL DATA: (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net revenue | $ 109,730 us-gaap_Revenues | $ 112,171 us-gaap_Revenues | $ 108,414 us-gaap_Revenues | $ 111,072 us-gaap_Revenues | $ 111,595 us-gaap_Revenues | $ 118,391 us-gaap_Revenues | [1] | $ 119,602 us-gaap_Revenues | [1] | $ 99,112 us-gaap_Revenues | [1] | $ 105,885 us-gaap_Revenues | $ 109,894 us-gaap_Revenues | $ 105,830 us-gaap_Revenues | [2] | $ 102,964 us-gaap_Revenues | $ 441,387 us-gaap_Revenues | $ 448,700 us-gaap_Revenues | $ 424,573 us-gaap_Revenues |
Operating income | 19,424 us-gaap_OperatingIncomeLoss | 19,560 us-gaap_OperatingIncomeLoss | 22,350 us-gaap_OperatingIncomeLoss | 15,831 us-gaap_OperatingIncomeLoss | 17,388 us-gaap_OperatingIncomeLoss | 21,795 us-gaap_OperatingIncomeLoss | [1] | 18,330 us-gaap_OperatingIncomeLoss | [1] | 15,455 us-gaap_OperatingIncomeLoss | [1] | 14,601 us-gaap_OperatingIncomeLoss | 21,498 us-gaap_OperatingIncomeLoss | 21,385 us-gaap_OperatingIncomeLoss | [2] | 13,725 us-gaap_OperatingIncomeLoss | 77,165 us-gaap_OperatingIncomeLoss | 72,968 us-gaap_OperatingIncomeLoss | 71,209 us-gaap_OperatingIncomeLoss |
Net (loss) income from continuing operations | (8,272)us-gaap_IncomeLossFromContinuingOperations | (8,758)us-gaap_IncomeLossFromContinuingOperations | (5,408)us-gaap_IncomeLossFromContinuingOperations | (20,302)us-gaap_IncomeLossFromContinuingOperations | (13,631)us-gaap_IncomeLossFromContinuingOperations | (8,904)us-gaap_IncomeLossFromContinuingOperations | [1] | (8,555)us-gaap_IncomeLossFromContinuingOperations | [1] | (13,305)us-gaap_IncomeLossFromContinuingOperations | [1] | (15,013)us-gaap_IncomeLossFromContinuingOperations | (10,215)us-gaap_IncomeLossFromContinuingOperations | 46,452 us-gaap_IncomeLossFromContinuingOperations | [2] | (75,156)us-gaap_IncomeLossFromContinuingOperations | (42,740)us-gaap_IncomeLossFromContinuingOperations | (44,395)us-gaap_IncomeLossFromContinuingOperations | (53,932)us-gaap_IncomeLossFromContinuingOperations |
Income (loss) from discontinued operations |  |  |  |  | (8)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | [1] | 3 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | [1] | 890 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | [1] | (128)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (40)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 13 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | [2] | (29)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 885 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (184)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |
Consolidated net loss attributable to common stockholders | $ (13,451)us-gaap_NetIncomeLoss | $ (13,220)us-gaap_NetIncomeLoss | $ (10,816)us-gaap_NetIncomeLoss | $ (25,183)us-gaap_NetIncomeLoss | $ (16,440)us-gaap_NetIncomeLoss | $ (13,221)us-gaap_NetIncomeLoss | [1] | $ (14,214)us-gaap_NetIncomeLoss | [1] | $ (18,106)us-gaap_NetIncomeLoss | [1] | $ (17,227)us-gaap_NetIncomeLoss | $ (13,064)us-gaap_NetIncomeLoss | $ 42,668 us-gaap_NetIncomeLoss | [2] | $ (79,242)us-gaap_NetIncomeLoss | $ (62,670)us-gaap_NetIncomeLoss | $ (61,981)us-gaap_NetIncomeLoss | $ (66,865)us-gaap_NetIncomeLoss |
BASIC NET (LOSS) INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income from continuing operations per share (in dollars per share) | $ (0.28)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.28)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.23)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.53)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.35)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.28)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ (0.29)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ (0.38)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ (0.34)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.26)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.85 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [2] | $ (1.58)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (1.32)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (1.30)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (1.33)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
Net (loss) income from discontinued operations per share (in dollars per share) |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [2] | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |
Consolidated net (loss) income per share attributable to common stockholders (in dollars per share) | $ (0.28)us-gaap_EarningsPerShareBasic | $ (0.28)us-gaap_EarningsPerShareBasic | $ (0.23)us-gaap_EarningsPerShareBasic | $ (0.53)us-gaap_EarningsPerShareBasic | $ (0.35)us-gaap_EarningsPerShareBasic | $ (0.28)us-gaap_EarningsPerShareBasic | [1] | $ (0.29)us-gaap_EarningsPerShareBasic | [1] | $ (0.36)us-gaap_EarningsPerShareBasic | [1] | $ (0.34)us-gaap_EarningsPerShareBasic | $ (0.26)us-gaap_EarningsPerShareBasic | $ 0.85 us-gaap_EarningsPerShareBasic | [2] | $ (1.58)us-gaap_EarningsPerShareBasic | $ (1.32)us-gaap_EarningsPerShareBasic | $ (1.28)us-gaap_EarningsPerShareBasic | $ (1.34)us-gaap_EarningsPerShareBasic | [3]
DILUTED NET (LOSS) INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income from continuing operations per share (in dollars per share) | $ (0.28)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.28)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.23)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.53)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.35)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.28)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ (0.29)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ (0.38)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ (0.34)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.26)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.85 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [2] | $ (1.58)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  |  |  |
Net (loss) income from discontinued operations per share (in dollars per share) |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [2] | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  |  |  |
Consolidated net (loss) income per share attributable to common stockholders (in dollars per share) | $ (0.28)us-gaap_EarningsPerShareDiluted | $ (0.28)us-gaap_EarningsPerShareDiluted | $ (0.23)us-gaap_EarningsPerShareDiluted | $ (0.53)us-gaap_EarningsPerShareDiluted | $ (0.35)us-gaap_EarningsPerShareDiluted | $ (0.28)us-gaap_EarningsPerShareDiluted | [1] | $ (0.29)us-gaap_EarningsPerShareDiluted | [1] | $ (0.36)us-gaap_EarningsPerShareDiluted | [1] | $ (0.34)us-gaap_EarningsPerShareDiluted | $ (0.26)us-gaap_EarningsPerShareDiluted | $ 0.85 us-gaap_EarningsPerShareDiluted | [2] | $ (1.58)us-gaap_EarningsPerShareDiluted |  |  |  |
WEIGHTED AVERAGE SHARES OUTSTANDING |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding - basic and diluted (in shares) | 47,608,038 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 47,601,371 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 47,465,653 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 47,441,175 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 47,441,175 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 47,443,031 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | [1] | 48,737,941 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | [1] | 49,861,964 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | [1] |  |  |  |  |  | 47,525,726 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 48,370,195 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 50,015,252 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |
Weighted average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  |  | 50,042,751 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 50,019,048 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 50,006,008 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [2] | 49,994,974 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  |  |  |
Weighted average shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 50,042,751 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 50,019,048 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 50,124,418 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [2] | 49,994,974 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  |  |  |
[1] | The net loss from continuing operations for the quarters ended March 31, 2013, June 30, 2013 and September 30, 2013 includes approximately $1.4 million, $9.8 million and $3.7 million, respectively of impairment charges.
[2] | The net income from continuing operations for the quarter ended June 30, 2012, includes $313,000 of impairment charges.
[3] | Per share amounts do not add due to rounding.

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