XML 39 R26.htm IDEA: XBRL DOCUMENT v2.4.1.9
Net Income per Share (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net income $ 13,787us-gaap_NetIncomeLoss $ 9,564us-gaap_NetIncomeLoss
Net income allocated to common shares 355us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted 282us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted
Net income allocated to common shares $ 13,432nsp_NetIncomeLossAvailableToCommonShareholdersBasic $ 9,282nsp_NetIncomeLossAvailableToCommonShareholdersBasic
Weighted average common shares outstanding (in shares) 24,716us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 24,823us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares from assumed conversions of common stock options (in shares) 8nsp_IncrementalSharesFromAssumedConversionsOfCommonStockOptions 7nsp_IncrementalSharesFromAssumedConversionsOfCommonStockOptions
Adjusted weighted average common shares outstanding (in shares) 24,724nsp_AdjustedWeightedAverageCommonSharesOutstanding 24,830nsp_AdjustedWeightedAverageCommonSharesOutstanding
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect (in shares) 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount